diff --git a/CHANGELOG.md b/CHANGELOG.md
index f4210fb4..0fa4de8b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,8 @@ Improvements:
   * `impl From<RoomAliasId> for RoomIdOrAliasId`
   * `impl TryFrom<RoomIdOrAliasId> for RoomId`
   * `impl TryFrom<RoomIdOrAliasId> for RoomAliasId`
+  * `RoomIdOrAliasId::into_either` (if the optional dependency `either` is activated with the
+    identically named feature)
 
 # 0.15.1
 
diff --git a/Cargo.toml b/Cargo.toml
index 39decbca..b46c2dd1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,6 +21,7 @@ default = ["serde"]
 
 [dependencies]
 diesel = { version = "1.4.4", optional = true }
+either = { version = "1.5.3", optional = true }
 rand = { version = "0.7.3", optional = true }
 serde = { version = "1.0.106", optional = true }
 
diff --git a/src/room_id_or_room_alias_id.rs b/src/room_id_or_room_alias_id.rs
index fd02007f..f0be719e 100644
--- a/src/room_id_or_room_alias_id.rs
+++ b/src/room_id_or_room_alias_id.rs
@@ -55,6 +55,22 @@ impl RoomIdOrAliasId {
         self.variant() == Variant::RoomAliasId
     }
 
+    /// Turn this `RoomIdOrAliasId` into `Either<RoomId, RoomAliasId>`
+    #[cfg(feature = "either")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "either")))]
+    pub fn into_either(self) -> either::Either<RoomId, RoomAliasId> {
+        match self.variant() {
+            Variant::RoomId => either::Either::Left(RoomId {
+                full_id: self.full_id,
+                colon_idx: self.colon_idx,
+            }),
+            Variant::RoomAliasId => either::Either::Right(RoomAliasId {
+                full_id: self.full_id,
+                colon_idx: self.colon_idx,
+            }),
+        }
+    }
+
     fn variant(&self) -> Variant {
         match self.full_id.bytes().next() {
             Some(b'!') => Variant::RoomId,