diff --git a/apps/participation/templates/participation/team_detail.html b/apps/participation/templates/participation/team_detail.html
index 5ac6626..f6fcf21 100644
--- a/apps/participation/templates/participation/team_detail.html
+++ b/apps/participation/templates/participation/team_detail.html
@@ -62,6 +62,9 @@
     </div>
     <div class="card-footer text-center">
         <button class="btn btn-primary" data-toggle="modal" data-target="#updateTeamModal">{% trans "Update" %}</button>
+        {% if not team.participation.valid %}
+            <button class="btn btn-danger" data-toggle="modal" data-target="#leaveTeamModal">{% trans "Leave" %}</button>
+        {% endif %}
     </div>
     </div>
 
@@ -120,6 +123,11 @@
     {% trans "Update" as modal_button %}
     {% url "participation:update_team" pk=team.pk as modal_action %}
     {% include "base_modal.html" with modal_id="updateTeam" %}
+
+    {% trans "Leave team" as modal_title %}
+    {% trans "Leave" as modal_button %}
+    {% url "participation:team_leave" as modal_action %}
+    {% include "base_modal.html" with modal_id="leaveTeam" modal_button_type="danger" %}
 {% endblock %}
 
 {% block extrajavascript %}
@@ -130,6 +138,11 @@
                 if (!modalBody.html().trim())
                     modalBody.load("{% url "participation:update_team" pk=team.pk %} #form-content");
             });
+            $('button[data-target="#leaveTeamModal"]').click(function() {
+                let modalBody = $("#leaveTeamModal div.modal-body");
+                if (!modalBody.html().trim())
+                    modalBody.load("{% url "participation:team_leave" %} #form-content");
+            });
         });
     </script>
 {% endblock %}
diff --git a/apps/participation/templates/participation/team_leave.html b/apps/participation/templates/participation/team_leave.html
new file mode 100644
index 0000000..72d3db9
--- /dev/null
+++ b/apps/participation/templates/participation/team_leave.html
@@ -0,0 +1,13 @@
+{% extends "base.html" %}
+
+{% load i18n %}
+
+{% block content %}
+    <form method="post">
+        <div class="alert alert-warning" id="form-content">
+            {% csrf_token %}
+            {% trans "Are you sure that you want to leave this team?" %}
+        </div>
+        <button class="btn btn-danger" type="submit">{% trans "Leave" %}</button>
+    </form>
+{% endblock %}
diff --git a/apps/participation/urls.py b/apps/participation/urls.py
index 54efc74..10b7676 100644
--- a/apps/participation/urls.py
+++ b/apps/participation/urls.py
@@ -1,7 +1,8 @@
 from django.urls import path
 
 from .views import CalendarView, CreateTeamView, JoinTeamView, MyParticipationDetailView, MyTeamDetailView, \
-    ParticipationDetailView, PhaseUpdateView, TeamAuthorizationsView, TeamDetailView, TeamUpdateView, UploadVideoView
+    ParticipationDetailView, PhaseUpdateView, TeamAuthorizationsView, TeamDetailView, TeamLeaveView, TeamUpdateView, \
+    UploadVideoView
 
 
 app_name = "participation"
@@ -13,6 +14,7 @@ urlpatterns = [
     path("team/<int:pk>/", TeamDetailView.as_view(), name="team_detail"),
     path("team/<int:pk>/update/", TeamUpdateView.as_view(), name="update_team"),
     path("team/<int:pk>/authorizations/", TeamAuthorizationsView.as_view(), name="team_authorizations"),
+    path("team/leave/", TeamLeaveView.as_view(), name="team_leave"),
     path("detail/", MyParticipationDetailView.as_view(), name="my_participation_detail"),
     path("detail/<int:pk>/", ParticipationDetailView.as_view(), name="participation_detail"),
     path("detail/upload-video/<int:pk>/", UploadVideoView.as_view(), name="upload_video"),
diff --git a/apps/participation/views.py b/apps/participation/views.py
index 0ca63e4..fa6d6bf 100644
--- a/apps/participation/views.py
+++ b/apps/participation/views.py
@@ -2,6 +2,9 @@ from io import BytesIO
 import os
 from zipfile import ZipFile
 
+from django.shortcuts import redirect
+from django.views.generic.base import View, TemplateView
+
 from corres2math.lists import get_sympa_client
 from corres2math.views import AdminMixin
 from django.contrib.auth.mixins import LoginRequiredMixin
@@ -236,6 +239,29 @@ class TeamAuthorizationsView(LoginRequiredMixin, DetailView):
         return response
 
 
+class TeamLeaveView(LoginRequiredMixin, TemplateView):
+    template_name = "participation/team_leave.html"
+
+    def dispatch(self, request, *args, **kwargs):
+        if not request.user.is_authenticated:
+            return self.handle_no_permission()
+        if not request.user.registration.team:
+            raise PermissionDenied(_("You are not in a team."))
+        if request.user.registration.team.participation.valid is not None:
+            raise PermissionDenied(_("The team is already validated or the validation is pending."))
+        return super().dispatch(request, *args, **kwargs)
+
+    @transaction.atomic()
+    def post(self, request, *args, **kwargs):
+        team = request.user.registration.team
+        request.user.registration.team = None
+        request.user.registration.save()
+        get_sympa_client().unsubscribe(request.user.email, f"equipe-{team.trigram.lower()}", False)
+        if team.students.count() + team.coachs.count() == 0:
+            team.delete()
+        return redirect(reverse_lazy("index"))
+
+
 class MyParticipationDetailView(LoginRequiredMixin, RedirectView):
     def get_redirect_url(self, *args, **kwargs):
         user = self.request.user
diff --git a/locale/fr/LC_MESSAGES/django.po b/locale/fr/LC_MESSAGES/django.po
index 1d24bce..76a01c1 100644
--- a/locale/fr/LC_MESSAGES/django.po
+++ b/locale/fr/LC_MESSAGES/django.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Corres2math\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2020-10-20 15:21+0200\n"
+"POT-Creation-Date: 2020-10-20 15:53+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: Yohann D'ANELLO <yohann.danello@animath.fr>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -99,7 +99,7 @@ msgstr "changelogs"
 msgid "Changelog of type \"{action}\" for model {model} at {timestamp}"
 msgstr "Changelog de type \"{action}\" pour le modèle {model} le {timestamp}"
 
-#: apps/participation/forms.py:15 apps/participation/models.py:27
+#: apps/participation/forms.py:15 apps/participation/models.py:28
 msgid "The trigram must be composed of three uppercase letters."
 msgstr "Le trigramme doit être composé de trois lettres majuscules."
 
@@ -131,28 +131,28 @@ msgstr "Cette phase doit commencer après les phases précédentes."
 msgid "This phase must end after the next phases."
 msgstr "Cette phase doit finir avant les phases suivantes."
 
-#: apps/participation/models.py:20 apps/participation/tables.py:30
+#: apps/participation/models.py:21 apps/participation/tables.py:30
 #: apps/participation/tables.py:52 apps/participation/tables.py:78
 msgid "name"
 msgstr "nom"
 
-#: apps/participation/models.py:26 apps/participation/tables.py:57
+#: apps/participation/models.py:27 apps/participation/tables.py:57
 msgid "trigram"
 msgstr "trigramme"
 
-#: apps/participation/models.py:34
+#: apps/participation/models.py:35
 msgid "access code"
 msgstr "code d'accès"
 
-#: apps/participation/models.py:35
+#: apps/participation/models.py:36
 msgid "The access code let other people to join the team."
 msgstr "Le code d'accès permet aux autres participants de rejoindre l'équipe."
 
-#: apps/participation/models.py:39
+#: apps/participation/models.py:40
 msgid "Grant Animath to publish my video"
 msgstr "Autoriser Animath à publier ma vidéo"
 
-#: apps/participation/models.py:40
+#: apps/participation/models.py:41
 msgid ""
 "Give the authorisation to publish the video on the main website to promote "
 "the action."
@@ -160,101 +160,101 @@ msgstr ""
 "Donner l'autorisation de publier la vidéo sur le site principal pour "
 "promouvoir les Correspondances."
 
-#: apps/participation/models.py:67
+#: apps/participation/models.py:72
 #, python-brace-format
 msgid "Team {name} ({trigram})"
 msgstr "Équipe {name} ({trigram})"
 
-#: apps/participation/models.py:70 apps/participation/models.py:81
+#: apps/participation/models.py:75 apps/participation/models.py:86
 #: apps/registration/models.py:89 apps/registration/models.py:134
 msgid "team"
 msgstr "équipe"
 
-#: apps/participation/models.py:71
+#: apps/participation/models.py:76
 msgid "teams"
 msgstr "équipes"
 
-#: apps/participation/models.py:85
+#: apps/participation/models.py:90
 #, python-brace-format
 msgid "Problem #{problem:d}"
 msgstr "Problème n°{problem:d}"
 
-#: apps/participation/models.py:88 apps/participation/tables.py:35
+#: apps/participation/models.py:93 apps/participation/tables.py:35
 #: apps/participation/tables.py:62
 msgid "problem number"
 msgstr "numéro de problème"
 
-#: apps/participation/models.py:94 apps/participation/models.py:145
+#: apps/participation/models.py:99 apps/participation/models.py:150
 msgid "valid"
 msgstr "valide"
 
-#: apps/participation/models.py:95 apps/participation/models.py:146
+#: apps/participation/models.py:100 apps/participation/models.py:151
 msgid "The video got the validation of the administrators."
 msgstr "La vidéo a été validée par les administrateurs."
 
-#: apps/participation/models.py:104
+#: apps/participation/models.py:109
 msgid "solution video"
 msgstr "vidéo de solution"
 
-#: apps/participation/models.py:113
+#: apps/participation/models.py:118
 msgid "received participation"
 msgstr "participation reçue"
 
-#: apps/participation/models.py:122
+#: apps/participation/models.py:127
 msgid "synthesis video"
 msgstr "vidéo de synthèse"
 
-#: apps/participation/models.py:129
+#: apps/participation/models.py:134
 #, python-brace-format
 msgid "Participation of the team {name} ({trigram})"
 msgstr "Participation de l'équipe {name} ({trigram})"
 
-#: apps/participation/models.py:132
+#: apps/participation/models.py:137
 msgid "participation"
 msgstr "participation"
 
-#: apps/participation/models.py:133
+#: apps/participation/models.py:138
 msgid "participations"
 msgstr "participations"
 
-#: apps/participation/models.py:138
+#: apps/participation/models.py:143
 msgid "link"
 msgstr "lien"
 
-#: apps/participation/models.py:139
+#: apps/participation/models.py:144
 msgid "The full video link."
 msgstr "Le lien complet de la vidéo."
 
-#: apps/participation/models.py:173
+#: apps/participation/models.py:178
 #, python-brace-format
 msgid "Video of team {name} ({trigram})"
 msgstr "Vidéo de l'équipe {name} ({trigram})"
 
-#: apps/participation/models.py:177
+#: apps/participation/models.py:182
 msgid "video"
 msgstr "vidéo"
 
-#: apps/participation/models.py:178
+#: apps/participation/models.py:183
 msgid "videos"
 msgstr "vidéos"
 
-#: apps/participation/models.py:185
+#: apps/participation/models.py:190
 msgid "phase number"
 msgstr "phase"
 
-#: apps/participation/models.py:190
+#: apps/participation/models.py:195
 msgid "phase description"
 msgstr "description"
 
-#: apps/participation/models.py:194
+#: apps/participation/models.py:199
 msgid "start date of the given phase"
 msgstr "début de la phase"
 
-#: apps/participation/models.py:199
+#: apps/participation/models.py:204
 msgid "end date of the given phase"
 msgstr "fin de la phase"
 
-#: apps/participation/models.py:214
+#: apps/participation/models.py:219
 msgid ""
 "Phase {phase_number:d} starts on {start:%Y-%m-%d %H:%M} and ends on {end:%Y-"
 "%m-%d %H:%M}"
@@ -262,11 +262,11 @@ msgstr ""
 "Phase {phase_number:d} démarrant le {start:%d/%m/%Y %H:%M} et finissant le "
 "{end:%d/%m/%Y %H:%M}"
 
-#: apps/participation/models.py:218
+#: apps/participation/models.py:223
 msgid "phase"
 msgstr "phase"
 
-#: apps/participation/models.py:219
+#: apps/participation/models.py:224
 msgid "phases"
 msgstr "phases"
 
@@ -281,9 +281,9 @@ msgid "Join"
 msgstr "Rejoindre"
 
 #: apps/participation/templates/participation/participation_detail.html:6
-#: apps/participation/templates/participation/team_detail.html:28
-#: apps/participation/templates/participation/team_detail.html:37
-#: apps/participation/templates/participation/team_detail.html:42
+#: apps/participation/templates/participation/team_detail.html:31
+#: apps/participation/templates/participation/team_detail.html:40
+#: apps/participation/templates/participation/team_detail.html:45
 #: apps/registration/templates/registration/user_detail.html:6
 #: apps/registration/templates/registration/user_detail.html:26
 msgid "any"
@@ -299,7 +299,7 @@ msgid "Team:"
 msgstr "Équipe :"
 
 #: apps/participation/templates/participation/participation_detail.html:16
-#: apps/participation/templates/participation/team_detail.html:41
+#: apps/participation/templates/participation/team_detail.html:44
 msgid "Chosen problem:"
 msgstr "Problème choisi :"
 
@@ -337,8 +337,8 @@ msgstr "La plateforme de cette vidéo n'est pas encore supportée."
 
 #: apps/participation/templates/participation/phase_form.html:11
 #: apps/participation/templates/participation/phase_list.html:18
-#: apps/participation/templates/participation/team_detail.html:61
-#: apps/participation/templates/participation/team_detail.html:117
+#: apps/participation/templates/participation/team_detail.html:64
+#: apps/participation/templates/participation/team_detail.html:123
 #: apps/participation/templates/participation/update_team.html:12
 #: apps/registration/templates/registration/update_user.html:12
 #: apps/registration/templates/registration/user_detail.html:64
@@ -364,34 +364,45 @@ msgid "Trigram:"
 msgstr "Trigramme :"
 
 #: apps/participation/templates/participation/team_detail.html:20
+#: apps/registration/templates/registration/user_detail.html:20
+msgid "Email:"
+msgstr "Adresse e-mail :"
+
+#: apps/participation/templates/participation/team_detail.html:23
 msgid "Access code:"
 msgstr "Code d'accès :"
 
-#: apps/participation/templates/participation/team_detail.html:23
+#: apps/participation/templates/participation/team_detail.html:26
 msgid "Coachs:"
 msgstr "Encadrants :"
 
-#: apps/participation/templates/participation/team_detail.html:32
+#: apps/participation/templates/participation/team_detail.html:35
 msgid "Participants:"
 msgstr "Participants :"
 
-#: apps/participation/templates/participation/team_detail.html:45
+#: apps/participation/templates/participation/team_detail.html:48
 msgid "Grant Animath to publish our video:"
 msgstr "Autoriser Animath à publier notre vidéo :"
 
-#: apps/participation/templates/participation/team_detail.html:48
+#: apps/participation/templates/participation/team_detail.html:51
 msgid "Authorizations:"
 msgstr "Autorisations :"
 
-#: apps/participation/templates/participation/team_detail.html:54
+#: apps/participation/templates/participation/team_detail.html:57
 msgid "Not uploaded yet"
 msgstr "Pas encore envoyée"
 
-#: apps/participation/templates/participation/team_detail.html:70
+#: apps/participation/templates/participation/team_detail.html:66
+#: apps/participation/templates/participation/team_detail.html:128
+#: apps/participation/templates/participation/team_leave.html:9
+msgid "Leave"
+msgstr "Quitter"
+
+#: apps/participation/templates/participation/team_detail.html:76
 msgid "Access to team participation"
 msgstr "Accéder à la participation de l'équipe"
 
-#: apps/participation/templates/participation/team_detail.html:77
+#: apps/participation/templates/participation/team_detail.html:83
 msgid ""
 "Your team has at least 3 members and all photo authorizations were given: "
 "the team can be validated."
@@ -399,11 +410,11 @@ msgstr ""
 "Votre équipe contient au moins 3 personnes et toutes les autorisations de "
 "droit à l'image ont été données : l'équipe peut être validée."
 
-#: apps/participation/templates/participation/team_detail.html:82
+#: apps/participation/templates/participation/team_detail.html:88
 msgid "Submit my team to validation"
 msgstr "Soumettre mon équipe à validation"
 
-#: apps/participation/templates/participation/team_detail.html:88
+#: apps/participation/templates/participation/team_detail.html:94
 msgid ""
 "Your team must be composed of 3 members and each member must upload its "
 "photo authorization and confirm its email address."
@@ -411,15 +422,15 @@ msgstr ""
 "Votre équipe doit être composée de 3 membres et chaque membre doit envoyer "
 "son autorisation de droit à l'image et confirmé son adresse e-mail."
 
-#: apps/participation/templates/participation/team_detail.html:93
+#: apps/participation/templates/participation/team_detail.html:99
 msgid "This team didn't ask for validation yet."
 msgstr "L'équipe n'a pas encore demandé à être validée."
 
-#: apps/participation/templates/participation/team_detail.html:99
+#: apps/participation/templates/participation/team_detail.html:105
 msgid "Your validation is pending."
 msgstr "Votre validation est en attente."
 
-#: apps/participation/templates/participation/team_detail.html:103
+#: apps/participation/templates/participation/team_detail.html:109
 msgid ""
 "The team requested to be validated. You may now control the authorizations "
 "and confirm that they can participate."
@@ -427,85 +438,92 @@ msgstr ""
 "L'équipe a demandé à être validée. Vous pouvez désormais contrôler les "
 "différentes autorisations et confirmer qu'elle peut participer."
 
-#: apps/participation/templates/participation/team_detail.html:109
+#: apps/participation/templates/participation/team_detail.html:115
 msgid "Validate"
 msgstr "Valider"
 
-#: apps/participation/templates/participation/team_detail.html:110
+#: apps/participation/templates/participation/team_detail.html:116
 msgid "Invalidate"
 msgstr "Invalider"
 
-#: apps/participation/templates/participation/team_detail.html:116
+#: apps/participation/templates/participation/team_detail.html:122
 msgid "Update team"
 msgstr "Modifier l'équipe"
 
-#: apps/participation/views.py:30 templates/base.html:77
+#: apps/participation/templates/participation/team_detail.html:127
+msgid "Leave team"
+msgstr "Quitter l'équipe"
+
+#: apps/participation/templates/participation/team_leave.html:7
+msgid "Are you sure that you want to leave this team?"
+msgstr "Êtes-vous sûr·e de vouloir quitter cette équipe ?"
+
+#: apps/participation/views.py:32 templates/base.html:77
 #: templates/base.html:228
 msgid "Create team"
 msgstr "Créer une équipe"
 
-#: apps/participation/views.py:37 apps/participation/views.py:67
+#: apps/participation/views.py:39 apps/participation/views.py:69
 msgid "You don't participate, so you can't create a team."
 msgstr "Vous ne participez pas, vous ne pouvez pas créer d'équipe."
 
-#: apps/participation/views.py:39 apps/participation/views.py:69
+#: apps/participation/views.py:41 apps/participation/views.py:71
 msgid "You are already in a team."
 msgstr "Vous êtes déjà dans une équipe."
 
-#: apps/participation/views.py:60 templates/base.html:82
+#: apps/participation/views.py:62 templates/base.html:82
 #: templates/base.html:224
 msgid "Join team"
 msgstr "Rejoindre une équipe"
 
-#: apps/participation/views.py:95 apps/participation/views.py:249
+#: apps/participation/views.py:97 apps/participation/views.py:248
+#: apps/participation/views.py:259
 msgid "You are not in a team."
 msgstr "Vous n'êtes pas dans une équipe."
 
-#: apps/participation/views.py:96 apps/participation/views.py:250
+#: apps/participation/views.py:98 apps/participation/views.py:260
 msgid "You don't participate, so you don't have any team."
 msgstr "Vous ne participez pas, vous n'avez donc pas d'équipe."
 
-#: apps/participation/views.py:135
+#: apps/participation/views.py:137
 msgid "You don't participate, so you can't request the validation of the team."
 msgstr ""
 "Vous ne participez pas, vous ne pouvez pas demander la validation de "
 "l'équipe."
 
-#: apps/participation/views.py:138
+#: apps/participation/views.py:140
 msgid "The validation of the team is already done or pending."
 msgstr "La validation de l'équipe est déjà faite ou en cours."
 
-#: apps/participation/views.py:151
+#: apps/participation/views.py:153
 msgid "You are not an administrator."
 msgstr "Vous n'êtes pas administrateur."
 
-#: apps/participation/views.py:154
+#: apps/participation/views.py:156
 msgid "This team has no pending validation."
 msgstr "L'équipe n'a pas de validation en attente."
 
-#: apps/participation/views.py:176
+#: apps/participation/views.py:175
 msgid "You must specify if you validate the registration or not."
 msgstr "Vous devez spécifier si vous validez l'inscription ou non."
 
-#: apps/participation/views.py:233 apps/registration/views.py:213
+#: apps/participation/views.py:232 apps/registration/views.py:213
 #, python-brace-format
 msgid "Photo authorization of {student}.{ext}"
 msgstr "Autorisation de droit à l'image de {student}.{ext}"
 
-#: apps/participation/views.py:237
+#: apps/participation/views.py:236
 #, python-brace-format
 msgid "Photo authorizations of team {trigram}.zip"
 msgstr "Autorisations de droit à l'image de l'équipe {trigram}.zip"
 
-#: apps/participation/views.py:259
+#: apps/participation/views.py:269
 msgid "The team is not validated yet."
 msgstr "L'équipe n'est pas encore validée."
 
-#: apps/participation/views.py:268
-#, fuzzy, python-brace-format
-#| msgid "Participation of the team {name} ({trigram})"
+#: apps/participation/views.py:278
 msgid "Participation of team {trigram}"
-msgstr "Participation de l'équipe {name} ({trigram})"
+msgstr "Participation de l'équipe {trigram}"
 
 #: apps/registration/forms.py:13
 msgid "role"
@@ -779,10 +797,6 @@ msgstr "Nom de famille :"
 msgid "First name:"
 msgstr "Prénom :"
 
-#: apps/registration/templates/registration/user_detail.html:20
-msgid "Email:"
-msgstr "Adresse e-mail :"
-
 #: apps/registration/templates/registration/user_detail.html:22
 msgid "Not confirmed"
 msgstr "Non confirmée"