diff --git a/crates/ruma-identity-service-api/CHANGELOG.md b/crates/ruma-identity-service-api/CHANGELOG.md
index cf0136db..256fe117 100644
--- a/crates/ruma-identity-service-api/CHANGELOG.md
+++ b/crates/ruma-identity-service-api/CHANGELOG.md
@@ -11,6 +11,7 @@ Improvements:
 * Add more endpoints:
   
   ```rust
+  association::unbind_3pid::v2,
   invitation::store_invitation::v2
   ```
 
diff --git a/crates/ruma-identity-service-api/src/association.rs b/crates/ruma-identity-service-api/src/association.rs
index 477aaf60..c237b41e 100644
--- a/crates/ruma-identity-service-api/src/association.rs
+++ b/crates/ruma-identity-service-api/src/association.rs
@@ -4,3 +4,4 @@ pub mod bind_3pid;
 pub mod check_3pid_validity;
 pub mod email;
 pub mod msisdn;
+pub mod unbind_3pid;
diff --git a/crates/ruma-identity-service-api/src/association/unbind_3pid.rs b/crates/ruma-identity-service-api/src/association/unbind_3pid.rs
new file mode 100644
index 00000000..7e744e15
--- /dev/null
+++ b/crates/ruma-identity-service-api/src/association/unbind_3pid.rs
@@ -0,0 +1,3 @@
+//! Endpoint to remove an association between a session and a Matrix user ID.
+
+pub mod v2;
diff --git a/crates/ruma-identity-service-api/src/association/unbind_3pid/v2.rs b/crates/ruma-identity-service-api/src/association/unbind_3pid/v2.rs
new file mode 100644
index 00000000..e34acf90
--- /dev/null
+++ b/crates/ruma-identity-service-api/src/association/unbind_3pid/v2.rs
@@ -0,0 +1,94 @@
+//! [POST /_matrix/identity/v2/3pid/unbind](https://matrix.org/docs/spec/identity_service/r0.3.0#post-matrix-identity-v2-3pid-unbind)
+
+use ruma_api::ruma_api;
+use ruma_common::thirdparty::Medium;
+use ruma_identifiers::{user_id::UserId, ClientSecretBox, SessionIdBox};
+use serde::{Deserialize, Serialize};
+
+ruma_api! {
+    metadata: {
+        description: "Remove an association between a session and a Matrix user ID.",
+        method: POST,
+        name: "unbind_3pid",
+        path: "/_matrix/identity/v2/3pid/unbind",
+        rate_limited: false,
+        authentication: AccessToken,
+    }
+
+    request: {
+        /// The proof that the client owns the 3PID.
+        ///
+        /// If this is not provided, the request must be signed by the homeserver which controls
+        /// the `mxid`.
+        #[serde(flatten)]
+        #[serde(skip_serializing_if = "Option::is_none")]
+        pub threepid_ownership_proof: Option<&'a ThreePidOwnershipProof>,
+
+        /// The Matrix user ID to remove from the 3PIDs.
+        pub mxid: &'a UserId,
+
+        /// The 3PID to remove. Must match the 3PID used to generate the session if using `sid` and
+        /// `client_secret` to authenticate this request.
+        pub threepid:  &'a ThirdPartyId,
+    }
+
+    #[derive(Default)]
+    response: {}
+}
+
+impl<'a> Request<'a> {
+    /// Creates a `Request` with the given Session ID, client secret, Matrix user ID and 3PID.
+    pub fn new(
+        threepid_ownership_proof: Option<&'a ThreePidOwnershipProof>,
+        mxid: &'a UserId,
+        threepid: &'a ThirdPartyId,
+    ) -> Self {
+        Self { threepid_ownership_proof, mxid, threepid }
+    }
+}
+
+impl Response {
+    /// Creates an empty `Response`.
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+/// A 3PID to unbind.
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
+pub struct ThirdPartyId {
+    /// A medium matching the medium of identifier to unbind.
+    pub medium: Medium,
+
+    /// The 3PID address to remove.
+    pub address: String,
+}
+
+impl ThirdPartyId {
+    /// Creates a new `ThirdPartyId` with the given medium and address.
+    pub fn new(medium: Medium, address: String) -> Self {
+        Self { medium, address }
+    }
+}
+
+/// A proof that the client owns the 3PID.
+///
+/// Must be constructed using the same session ID and client secret generated and passed by the
+/// `requestToken` call for the given 3PID.
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
+pub struct ThreePidOwnershipProof {
+    /// The Session ID generated by the `requestToken` call.
+    pub sid: SessionIdBox,
+
+    /// The client secret passed to the `requestToken` call.
+    pub client_secret: ClientSecretBox,
+}
+
+impl ThreePidOwnershipProof {
+    /// Creates a new `ThreePidOwnershipProof` with the given session ID and client secret.
+    pub fn new(sid: SessionIdBox, client_secret: ClientSecretBox) -> Self {
+        Self { sid, client_secret }
+    }
+}