diff --git a/crates/ruma-client-api/src/profile.rs b/crates/ruma-client-api/src/profile.rs
index f87c1437..797ff4f5 100644
--- a/crates/ruma-client-api/src/profile.rs
+++ b/crates/ruma-client-api/src/profile.rs
@@ -3,5 +3,7 @@
 pub mod get_avatar_url;
 pub mod get_display_name;
 pub mod get_profile;
+pub mod get_timezone_key;
 pub mod set_avatar_url;
 pub mod set_display_name;
+pub mod set_timezone_key;
diff --git a/crates/ruma-client-api/src/profile/get_profile.rs b/crates/ruma-client-api/src/profile/get_profile.rs
index 7705950b..80715170 100644
--- a/crates/ruma-client-api/src/profile/get_profile.rs
+++ b/crates/ruma-client-api/src/profile/get_profile.rs
@@ -1,11 +1,17 @@
 //! `GET /_matrix/client/*/profile/{userId}`
 //!
 //! Get all profile information of an user.
+//!
+//! TODO: implement the "generic-ness" of MSC4133
 
 pub mod v3 {
     //! `/v3/` ([spec])
     //!
     //! [spec]: https://spec.matrix.org/latest/client-server-api/#get_matrixclientv3profileuserid
+    //!
+    //! also see: `msc4133` ([MSC])
+    //!
+    //! [MSC]: https://github.com/tcpipuk/matrix-spec-proposals/blob/main/proposals/4133-extended-profiles.md
 
     use ruma_common::{
         api::{request, response, Metadata},
@@ -17,6 +23,7 @@ pub mod v3 {
         rate_limited: false,
         authentication: None,
         history: {
+            unstable => "/_matrix/client/unstable/uk.tcpip.msc4133/profile/:user_id",
             1.0 => "/_matrix/client/r0/profile/:user_id",
             1.1 => "/_matrix/client/v3/profile/:user_id",
         }
@@ -56,6 +63,14 @@ pub mod v3 {
         #[cfg(feature = "unstable-msc2448")]
         #[serde(rename = "xyz.amorgan.blurhash", skip_serializing_if = "Option::is_none")]
         pub blurhash: Option<String>,
+
+        /// [MSC4175][msc]: `m.tz` field for specifying a timezone the user is in
+        ///
+        /// [msc]: https://github.com/matrix-org/matrix-spec-proposals/blob/clokep/profile-tz/proposals/4175-profile-field-time-zone.md
+        ///
+        /// TODO: strong type this to be a valid IANA timezone?
+        #[serde(rename = "us.cloke.msc4175.tz", skip_serializing_if = "Option::is_none")]
+        pub tz: Option<String>,
     }
 
     impl Request {
@@ -66,13 +81,14 @@ pub mod v3 {
     }
 
     impl Response {
-        /// Creates a new `Response` with the given avatar URL and display name.
+        /// Creates a new `Response` with the given avatar URL, display name, and timezone.
         pub fn new(avatar_url: Option<OwnedMxcUri>, displayname: Option<String>) -> Self {
             Self {
                 avatar_url,
                 displayname,
                 #[cfg(feature = "unstable-msc2448")]
                 blurhash: None,
+                tz: None,
             }
         }
     }
diff --git a/crates/ruma-client-api/src/profile/get_timezone_key.rs b/crates/ruma-client-api/src/profile/get_timezone_key.rs
new file mode 100644
index 00000000..6c24b269
--- /dev/null
+++ b/crates/ruma-client-api/src/profile/get_timezone_key.rs
@@ -0,0 +1,55 @@
+//! `GET /_matrix/client/*/profile/{userId}/m.tz`
+//!
+//! Get the timezone key of a user.
+
+pub mod unstable {
+    use ruma_common::{
+        api::{request, response, Metadata},
+        metadata, OwnedUserId,
+    };
+
+    const METADATA: Metadata = metadata! {
+        method: GET,
+        rate_limited: false,
+        authentication: None,
+        history: {
+            unstable => "/_matrix/client/unstable/uk.tcpip.msc4133/profile/:user_id/us.cloke.msc4175.tz",
+            // 1.12 => "/_matrix/client/v3/profile/:user_id/m.tz",
+        }
+    };
+
+    /// Request type for the `get_timezone` endpoint.
+    #[request(error = crate::Error)]
+    pub struct Request {
+        /// The user whose timezone will be retrieved.
+        #[ruma_api(path)]
+        pub user_id: OwnedUserId,
+    }
+
+    /// Response type for the `get_timezone` endpoint.
+    #[response(error = crate::Error)]
+    #[derive(Default)]
+    pub struct Response {
+        /// [MSC4175][msc]: `m.tz` field for specifying a timezone the user is in
+        ///
+        /// [msc]: https://github.com/matrix-org/matrix-spec-proposals/blob/clokep/profile-tz/proposals/4175-profile-field-time-zone.md
+        ///
+        /// TODO: strong type this to be a valid IANA timezone?
+        #[serde(rename = "us.cloke.msc4175.tz", skip_serializing_if = "Option::is_none")]
+        pub tz: Option<String>,
+    }
+
+    impl Request {
+        /// Creates a new `Request` with the given user ID.
+        pub fn new(user_id: OwnedUserId) -> Self {
+            Self { user_id }
+        }
+    }
+
+    impl Response {
+        /// Creates a new `Response` with the given timezone.
+        pub fn new(tz: Option<String>) -> Self {
+            Self { tz }
+        }
+    }
+}
diff --git a/crates/ruma-client-api/src/profile/set_timezone_key.rs b/crates/ruma-client-api/src/profile/set_timezone_key.rs
new file mode 100644
index 00000000..b3c39ad0
--- /dev/null
+++ b/crates/ruma-client-api/src/profile/set_timezone_key.rs
@@ -0,0 +1,58 @@
+//! `PUT /_matrix/client/*/profile/{userId}/m.tz`
+//!
+//! Set the timezone key of the user.
+
+pub mod unstable {
+    use ruma_common::{
+        api::{request, response, Metadata},
+        metadata, OwnedUserId,
+    };
+
+    const METADATA: Metadata = metadata! {
+        method: PUT,
+        rate_limited: true,
+        authentication: AccessToken,
+        history: {
+            unstable => "/_matrix/client/unstable/uk.tcpip.msc4133/profile/:user_id/us.cloke.msc4175.tz",
+            // 1.12 => "/_matrix/client/v3/profile/:user_id/m.tz",
+        }
+    };
+
+    /// Request type for the `set_timezone_key` endpoint.
+    #[request(error = crate::Error)]
+    pub struct Request {
+        /// The user whose timezone will be set.
+        #[ruma_api(path)]
+        pub user_id: OwnedUserId,
+
+        /// [MSC4175][msc]: `m.tz` field for specifying a timezone the user is in
+        ///
+        /// [msc]: https://github.com/matrix-org/matrix-spec-proposals/blob/clokep/profile-tz/proposals/4175-profile-field-time-zone.md
+        ///
+        /// TODO: strong type this to be a valid IANA timezone?
+        #[serde(rename = "us.cloke.msc4175.tz", skip_serializing_if = "Option::is_none")]
+        pub tz: Option<String>,
+    }
+
+    /// Response type for the `set_timezone_key` endpoint.
+    #[response(error = crate::Error)]
+    #[derive(Default)]
+    pub struct Response {}
+
+    impl Request {
+        /// Creates a new `Request` with the given user ID and timezone.
+        pub fn new(user_id: OwnedUserId, tz: Option<String>) -> Self {
+            Self {
+                user_id,
+                tz,
+            }
+        }
+    }
+
+    impl Response {
+        /// Creates an empty `Response`.
+        pub fn new() -> Self {
+            Self {}
+        }
+    }
+}