diff --git a/README.md b/README.md
index df44da5..140b60f 100644
--- a/README.md
+++ b/README.md
@@ -102,6 +102,20 @@ These options are forwarded to ``HTTPClient`` when it creates the underlying
 ``aiohttp.ClientSession``. You can specify a custom ``connector`` or any other
 session parameter supported by ``aiohttp``.
 
+### Default Allowed Mentions
+
+Specify default mention behaviour for all outgoing messages when constructing the client:
+
+```python
+client = disagreement.Client(
+    token=token,
+    allowed_mentions={"parse": [], "replied_user": False},
+)
+```
+
+This dictionary is used whenever ``send_message`` is called without an explicit
+``allowed_mentions`` argument.
+
 ### Defining Subcommands with `AppCommandGroup`
 
 ```python
diff --git a/disagreement/client.py b/disagreement/client.py
index 3c42629..c8e37c1 100644
--- a/disagreement/client.py
+++ b/disagreement/client.py
@@ -80,6 +80,8 @@ class Client:
         command_prefix (Union[str, List[str], Callable[['Client', Message], Union[str, List[str]]]]):
             The prefix(es) for commands. Defaults to '!'.
         verbose (bool): If True, print raw HTTP and Gateway traffic for debugging.
+        mention_replies (bool): Whether replies mention the author by default.
+        allowed_mentions (Optional[Dict[str, Any]]): Default allowed mentions for messages.
         http_options (Optional[Dict[str, Any]]): Extra options passed to
             :class:`HTTPClient` for creating the internal
             :class:`aiohttp.ClientSession`.
@@ -98,6 +100,7 @@ class Client:
         application_id: Optional[Union[str, int]] = None,
         verbose: bool = False,
         mention_replies: bool = False,
+        allowed_mentions: Optional[Dict[str, Any]] = None,
         shard_count: Optional[int] = None,
         gateway_max_retries: int = 5,
         gateway_max_backoff: float = 60.0,
@@ -170,6 +173,7 @@ class Client:
 
         # Default whether replies mention the user
         self.mention_replies: bool = mention_replies
+        self.allowed_mentions: Optional[Dict[str, Any]] = allowed_mentions
 
         # Basic signal handling for graceful shutdown
         # This might be better handled by the user's application code, but can be a nice default.
@@ -1012,7 +1016,7 @@ class Client:
             embeds (Optional[List[Embed]]): A list of embeds to send. Cannot be used with `embed`.
                                             Discord supports up to 10 embeds per message.
             components (Optional[List[ActionRow]]): A list of ActionRow components to include.
-            allowed_mentions (Optional[Dict[str, Any]]): Allowed mentions for the message.
+            allowed_mentions (Optional[Dict[str, Any]]): Allowed mentions for the message. Defaults to :attr:`Client.allowed_mentions`.
             message_reference (Optional[Dict[str, Any]]): Message reference for replying.
             attachments (Optional[List[Any]]): Attachments to include with the message.
             files (Optional[List[Any]]): Files to upload with the message.
@@ -1059,6 +1063,9 @@ class Client:
                 if isinstance(comp, ComponentModel)
             ]
 
+        if allowed_mentions is None:
+            allowed_mentions = self.allowed_mentions
+
         message_data = await self._http.send_message(
             channel_id=channel_id,
             content=content,
diff --git a/docs/mentions.md b/docs/mentions.md
new file mode 100644
index 0000000..2a604cf
--- /dev/null
+++ b/docs/mentions.md
@@ -0,0 +1,23 @@
+# Controlling Mentions
+
+The client exposes settings to control how mentions behave in outgoing messages.
+
+## Default Allowed Mentions
+
+Use the ``allowed_mentions`` parameter of :class:`disagreement.Client` to set a
+default for all messages:
+
+```python
+client = disagreement.Client(
+    token="YOUR_TOKEN",
+    allowed_mentions={"parse": [], "replied_user": False},
+)
+```
+
+When ``Client.send_message`` is called without an explicit ``allowed_mentions``
+argument this value will be used.
+
+## Next Steps
+
+- [Commands](commands.md)
+- [HTTP Client Options](http_client.md)