diff --git a/taiga/users/filters.py b/taiga/users/filters.py
index 2c7e47f9..9357bfa3 100644
--- a/taiga/users/filters.py
+++ b/taiga/users/filters.py
@@ -25,6 +25,11 @@ from . import services
 class ContactsFilterBackend(PermissionBasedFilterBackend):
     def filter_queryset(self, user, request, queryset, view):
         qs = user.contacts_visible_by_user(request.user)
+
+        exclude_project = request.QUERY_PARAMS.get('exclude_project', None)
+        if exclude_project:
+            qs = qs.exclude(projects__id=exclude_project)
+
         q = request.QUERY_PARAMS.get('q', None)
         if q:
             table = qs.model._meta.db_table
diff --git a/tests/integration/test_users.py b/tests/integration/test_users.py
index 678d4a03..6835f62b 100644
--- a/tests/integration/test_users.py
+++ b/tests/integration/test_users.py
@@ -447,6 +447,42 @@ def test_list_contacts_public_projects(client):
     assert response_content[0]["id"] == user_2.id
 
 
+def test_list_contacts_filter_exclude_project(client):
+    project1 = f.ProjectFactory.create()
+    project2 = f.ProjectFactory.create()
+    user_1 = f.UserFactory.create()
+    user_2 = f.UserFactory.create()
+    user_3 = f.UserFactory.create()
+    user_4 = f.UserFactory.create()
+    role1 = f.RoleFactory(project=project1, permissions=["view_project"])
+    role2 = f.RoleFactory(project=project2, permissions=["view_project"])
+
+    membership_11 = f.MembershipFactory.create(project=project1, user=user_1, role=role1)
+    membership_12 = f.MembershipFactory.create(project=project1, user=user_2, role=role1)
+
+    membership_21 = f.MembershipFactory.create(project=project2, user=user_1, role=role2)
+    membership_23 = f.MembershipFactory.create(project=project2, user=user_3, role=role2)
+    membership_24 = f.MembershipFactory.create(project=project2, user=user_4, role=role2)
+
+    url = reverse('users-contacts', kwargs={"pk": user_1.pk})
+
+    client.login(user_1)
+    response = client.get(url, content_type="application/json")
+    assert response.status_code == 200
+    response_content = response.data
+    assert len(response_content) == 3
+
+    response = client.get(url + "?exclude_project={}".format(project1.id), content_type="application/json")
+    assert response.status_code == 200
+    response_content = response.data
+    assert len(response_content) == 2
+
+    response = client.get(url + "?exclude_project={}".format(project2.id), content_type="application/json")
+    assert response.status_code == 200
+    response_content = response.data
+    assert len(response_content) == 1
+
+
 ##############################
 ## Mail permissions
 ##############################