diff --git a/addons/crm/views/crm_lead_views.xml b/addons/crm/views/crm_lead_views.xml
index 25984a1de57..08463bd3613 100644
--- a/addons/crm/views/crm_lead_views.xml
+++ b/addons/crm/views/crm_lead_views.xml
@@ -498,7 +498,7 @@
                     <field name="company_currency"/>
                     <templates>
                         <div t-name="activity-box">
-                            <img t-att-src="activity_image('res.users', 'avatar_128', record.user_id.raw_value)" t-att-title="record.user_id.value" t-att-alt="record.user_id.value"/>
+                            <field name="user_id" widget="many2one_avatar_user"/>
                             <div>
                                 <field name="name" display="full"/>
                                 <field name="expected_revenue" widget="monetary" display="full" muted="1"/>
diff --git a/addons/mail/static/src/js/m2x_avatar_user.js b/addons/mail/static/src/js/m2x_avatar_user.js
index 0d3d4fa4496..c8f90b2feab 100644
--- a/addons/mail/static/src/js/m2x_avatar_user.js
+++ b/addons/mail/static/src/js/m2x_avatar_user.js
@@ -97,4 +97,5 @@ export const Many2ManyAvatarUser = FieldMany2ManyTagsAvatar.extend(M2XAvatarMixi
 
 fieldRegistry.add('many2one_avatar_user', Many2OneAvatarUser);
 fieldRegistry.add('kanban.many2one_avatar_user', KanbanMany2OneAvatarUser);
+fieldRegistry.add('activity.many2one_avatar_user', KanbanMany2OneAvatarUser);
 fieldRegistry.add('many2many_avatar_user', Many2ManyAvatarUser);
diff --git a/addons/mail/static/src/scss/activity_view.scss b/addons/mail/static/src/scss/activity_view.scss
index 276c78cc928..817227f1202 100644
--- a/addons/mail/static/src/scss/activity_view.scss
+++ b/addons/mail/static/src/scss/activity_view.scss
@@ -69,8 +69,9 @@
         padding: 8px 8px;
         cursor: pointer;
 
-        > img {
+        .o_m2o_avatar > img, > img {
             width: 32px;
+            height: 32px;
             max-height: 32px;
             margin-right: 16px;
         }
diff --git a/addons/mail/static/tests/activity_tests.js b/addons/mail/static/tests/activity_tests.js
index 70d02c37b79..2e37e8f4123 100644
--- a/addons/mail/static/tests/activity_tests.js
+++ b/addons/mail/static/tests/activity_tests.js
@@ -528,4 +528,57 @@ QUnit.test("Activity view: discard an activity creation dialog", async function
     assert.containsNone($, ".modal.o_technical_modal", "Activity Modal should be closed");
 });
 
+QUnit.test('Activity view: many2one_avatar_user widget in activity view', async function (assert) {
+    assert.expect(3);
+
+    const taskModel = serverData.models.task;
+
+    serverData.models['res.users'] = {
+        fields: {
+            display_name: { string: "Displayed name", type: "char" },
+            avatar_128: { string: "Image 128", type: 'image' },
+        },
+        records: [{
+            id: 1,
+            display_name: "first user",
+            avatar_128: "Atmaram Bhide",
+        }],
+    };
+    taskModel.fields.user_id = { string: "Related User", type: "many2one", relation: 'res.users' };
+    taskModel.records[0].user_id = 1;
+
+    serverData.actions = {
+        1: {
+            id: 1,
+            name: 'Task Action',
+            res_model: 'task',
+            type: 'ir.actions.act_window',
+            views: [[false, 'activity']],
+        }
+    };
+
+    serverData.views = {
+        'task,false,activity': `
+            <activity string="Task">
+                <templates>
+                    <div t-name="activity-box">
+                        <field name="user_id" widget="many2one_avatar_user"/>
+                        <field name="foo"/>
+                    </div>
+                </templates>
+            </activity>`,
+        'task,false,search': '<search></search>'
+    };
+
+    const webClient = await createWebClient({ serverData, legacyParams: { withLegacyMockServer: true } });
+    await doAction(webClient, 1);
+
+    await legacyExtraNextTick();
+    assert.containsN(webClient, '.o_m2o_avatar', 2);
+    assert.containsOnce(webClient, 'tr[data-res-id=13] .o_m2o_avatar > img[src="/web/image/res.users/1/avatar_128"]',
+        "should have m2o avatar image");
+    assert.containsNone(webClient, '.o_m2o_avatar > span',
+        "should not have text on many2one_avatar_user if onlyImage node option is passed");
+});
+
 });
diff --git a/addons/project/views/project_views.xml b/addons/project/views/project_views.xml
index dc20b6bd6eb..a2027ecf442 100644
--- a/addons/project/views/project_views.xml
+++ b/addons/project/views/project_views.xml
@@ -1082,7 +1082,7 @@
                     <field name="user_id"/>
                     <templates>
                         <div t-name="activity-box">
-                            <img t-att-src="activity_image('res.users', 'avatar_128', record.user_id.raw_value)" t-att-title="record.user_id.value" t-att-alt="record.user_id.value"/>
+                            <field name="user_id" widget="many2one_avatar_user"/>
                             <div>
                                 <field name="name" display="full"/>
                                 <field name="project_id" muted="1" display="full" invisible="context.get('default_project_id', False)"/>