diff --git a/app/actor.py b/app/actor.py
index 76e985b..05061c4 100644
--- a/app/actor.py
+++ b/app/actor.py
@@ -259,9 +259,11 @@ class ActorMetadata:
     is_following: bool
     is_follower: bool
     is_follow_request_sent: bool
+    is_follow_request_rejected: bool
     outbox_follow_ap_id: str | None
     inbox_follow_ap_id: str | None
     moved_to: typing.Optional["ActorModel"]
+    has_blocked_local_actor: bool
 
 
 ActorsMetadata = dict[str, ActorMetadata]
@@ -304,6 +306,26 @@ async def get_actors_metadata(
             )
         )
     }
+    rejected_follow_requests = {
+        reject.activity_object_ap_id
+        for reject in await db_session.execute(
+            select(models.InboxObject.activity_object_ap_id).where(
+                models.InboxObject.ap_type == "Reject",
+                models.InboxObject.ap_actor_id.in_(ap_actor_ids),
+            )
+        )
+    }
+    blocks = {
+        block.ap_actor_id
+        for block in await db_session.execute(
+            select(models.InboxObject.ap_actor_id).where(
+                models.InboxObject.ap_type == "Block",
+                models.InboxObject.undone_by_inbox_object_id.is_(None),
+                models.InboxObject.ap_actor_id.in_(ap_actor_ids),
+            )
+        )
+    }
+
     idx: ActorsMetadata = {}
     for actor in actors:
         if not actor.ap_id:
@@ -326,9 +348,15 @@ async def get_actors_metadata(
             is_following=actor.ap_id in following,
             is_follower=actor.ap_id in followers,
             is_follow_request_sent=actor.ap_id in sent_follow_requests,
+            is_follow_request_rejected=bool(
+                sent_follow_requests[actor.ap_id] in rejected_follow_requests
+            )
+            if actor.ap_id in sent_follow_requests
+            else False,
             outbox_follow_ap_id=sent_follow_requests.get(actor.ap_id),
             inbox_follow_ap_id=followers.get(actor.ap_id),
             moved_to=moved_to,
+            has_blocked_local_actor=actor.ap_id in blocks,
         )
     return idx
 
diff --git a/app/boxes.py b/app/boxes.py
index cc21a9a..df8bd1e 100644
--- a/app/boxes.py
+++ b/app/boxes.py
@@ -1406,6 +1406,13 @@ async def _handle_undo_activity(
                     inbox_object_id=ap_activity_to_undo.id,
                 )
                 db_session.add(notif)
+    elif ap_activity_to_undo.ap_type == "Block":
+        notif = models.Notification(
+            notification_type=models.NotificationType.UNBLOCKED,
+            actor_id=from_actor.id,
+            inbox_object_id=ap_activity_to_undo.id,
+        )
+        db_session.add(notif)
     else:
         logger.warning(f"Don't know how to undo {ap_activity_to_undo.ap_type} activity")
 
@@ -1945,6 +1952,28 @@ async def _handle_like_activity(
         db_session.add(notif)
 
 
+async def _handle_block_activity(
+    db_session: AsyncSession,
+    actor: models.Actor,
+    block_activity: models.InboxObject,
+):
+    if block_activity.activity_object_ap_id != LOCAL_ACTOR.ap_id:
+        logger.warning(
+            "Received invalid Block activity "
+            f"{block_activity.activity_object_ap_id=}"
+        )
+        await db_session.delete(block_activity)
+        return
+
+    # Create a notification
+    notif = models.Notification(
+        notification_type=models.NotificationType.BLOCKED,
+        actor_id=actor.id,
+        inbox_object_id=block_activity.id,
+    )
+    db_session.add(notif)
+
+
 async def _process_transient_object(
     db_session: AsyncSession,
     raw_object: ap.RawObject,
@@ -2210,7 +2239,11 @@ async def save_to_inbox(
         # View is used by Peertube, there's nothing useful we can do with it
         await db_session.delete(inbox_object)
     elif activity_ro.ap_type == "Block":
-        pass
+        await _handle_block_activity(
+            db_session,
+            actor,
+            inbox_object,
+        )
     else:
         logger.warning(f"Received an unknown {inbox_object.ap_type} object")
 
diff --git a/app/models.py b/app/models.py
index 0708341..78c1b14 100644
--- a/app/models.py
+++ b/app/models.py
@@ -551,6 +551,9 @@ class NotificationType(str, enum.Enum):
     UPDATED_WEBMENTION = "updated_webmention"
     DELETED_WEBMENTION = "deleted_webmention"
 
+    BLOCKED = "blocked"
+    UNBLOCKED = "unblocked"
+
 
 class Notification(Base):
     __tablename__ = "notifications"
diff --git a/app/templates/notifications.html b/app/templates/notifications.html
index a5e069f..3cf5d5a 100644
--- a/app/templates/notifications.html
+++ b/app/templates/notifications.html
@@ -36,6 +36,12 @@
             {%- elif notif.notification_type.value == "follow_request_rejected" %}
                 {{ notif_actor_action(notif, "rejected your follow request") }}
                 {{ utils.display_actor(notif.actor, actors_metadata) }}
+            {% elif notif.notification_type.value == "blocked" %}
+                {{ notif_actor_action(notif, "blocked you") }}
+                {{ utils.display_actor(notif.actor, actors_metadata) }}
+            {% elif notif.notification_type.value == "unblocked" %}
+                {{ notif_actor_action(notif, "unblocked you") }}
+                {{ utils.display_actor(notif.actor, actors_metadata) }}
             {%- elif notif.notification_type.value == "move" %}
                 {# for move notif, the actor is the target and the inbox object the Move activity #}
                 <div class="actor-action">
diff --git a/app/templates/utils.html b/app/templates/utils.html
index 9af1f21..57aec8b 100644
--- a/app/templates/utils.html
+++ b/app/templates/utils.html
@@ -216,6 +216,9 @@
 <div>
     <nav class="flexbox actor-metadata">
         <ul>
+            {% if metadata.has_blocked_local_actor %}
+                <li>blocked you</li>
+            {% endif %}
             {% if metadata.is_following %}
                 <li>already following</li>
                 <li>{{ admin_undo_button(metadata.outbox_follow_ap_id, "unfollow")}}</li>
@@ -223,8 +226,15 @@
                     <li>{{ admin_profile_button(actor.ap_id) }}</li>
                 {% endif %}
             {% elif metadata.is_follow_request_sent %}
-                <li>follow request sent</li>
-                <li>{{ admin_undo_button(metadata.outbox_follow_ap_id, "undo follow") }}</li>
+                {% if metadata.is_follow_request_rejected %}
+                    <li>follow request rejected</li>
+                    {% if not metadata.has_blocked_local_actor %}
+                        <li>{{ admin_follow_button(actor) }}</li>
+                    {% endif %}
+                {% else %}
+                    <li>follow request sent</li>
+                    <li>{{ admin_undo_button(metadata.outbox_follow_ap_id, "undo follow") }}</li>
+                {% endif %}
             {% elif not actor.moved_to %}
                 <li>{{ admin_follow_button(actor) }}</li>
             {% endif %}
diff --git a/tests/factories.py b/tests/factories.py
index d2d4e3f..2c397e8 100644
--- a/tests/factories.py
+++ b/tests/factories.py
@@ -68,6 +68,20 @@ def build_accept_activity(
     }
 
 
+def build_block_activity(
+    from_remote_actor: actor.RemoteActor,
+    for_remote_actor: actor.RemoteActor,
+    outbox_public_id: str | None = None,
+) -> ap.RawObject:
+    return {
+        "@context": ap.AS_CTX,
+        "type": "Block",
+        "id": from_remote_actor.ap_id + "/block/" + (outbox_public_id or uuid4().hex),
+        "actor": from_remote_actor.ap_id,
+        "object": for_remote_actor.ap_id,
+    }
+
+
 def build_move_activity(
     from_remote_actor: actor.RemoteActor,
     for_remote_object: actor.RemoteActor,
diff --git a/tests/test_inbox.py b/tests/test_inbox.py
index 1cff853..325ab7b 100644
--- a/tests/test_inbox.py
+++ b/tests/test_inbox.py
@@ -423,3 +423,53 @@ def test_inbox__move_activity(
     ).scalar_one()
     assert notif.actor.ap_id == new_ra.ap_id
     assert notif.inbox_object_id == inbox_activity.id
+
+
+def test_inbox__block_activity(
+    db: Session,
+    client: TestClient,
+    respx_mock: respx.MockRouter,
+) -> None:
+    # Given a remote actor
+    ra = setup_remote_actor(respx_mock)
+
+    # Which is followed by the local actor
+    setup_remote_actor_as_following(ra)
+
+    # When receiving a Block activity
+    follow_activity = RemoteObject(
+        factories.build_block_activity(
+            from_remote_actor=ra,
+            for_remote_actor=LOCAL_ACTOR,
+        ),
+        ra,
+    )
+    with mock_httpsig_checker(ra):
+        response = client.post(
+            "/inbox",
+            headers={"Content-Type": ap.AS_CTX},
+            json=follow_activity.ap_object,
+        )
+
+    # Then the server returns a 202
+    assert response.status_code == 202
+
+    run_process_next_incoming_activity()
+
+    # And the actor was saved in DB
+    saved_actor = db.execute(select(models.Actor)).scalar_one()
+    assert saved_actor.ap_id == ra.ap_id
+
+    # And the Block activity was saved in the inbox
+    inbox_activity = db.execute(
+        select(models.InboxObject).where(models.InboxObject.ap_type == "Block")
+    ).scalar_one()
+
+    # And a notification was created
+    notif = db.execute(
+        select(models.Notification).where(
+            models.Notification.notification_type == models.NotificationType.BLOCKED
+        )
+    ).scalar_one()
+    assert notif.actor.ap_id == ra.ap_id
+    assert notif.inbox_object_id == inbox_activity.id