diff --git a/src/Internal/Api/Main.elm b/src/Internal/Api/Main.elm
index bf9b1ea..c0d3f2b 100644
--- a/src/Internal/Api/Main.elm
+++ b/src/Internal/Api/Main.elm
@@ -1,6 +1,6 @@
 module Internal.Api.Main exposing
     ( Msg
-    , sendMessageEvent, sync
+    , sendMessageEvent, sendStateEvent, sync
     )
 
 {-|
@@ -18,7 +18,7 @@ This module is used as reference for getting
 
 ## Actions
 
-@docs sendMessageEvent, sync
+@docs sendMessageEvent, sendStateEvent, sync
 
 -}
 
@@ -59,6 +59,31 @@ sendMessageEvent env data =
         (Context.apiFormat env.context)
 
 
+{-| Send a state event to a room.
+-}
+sendStateEvent :
+    E.Envelope a
+    ->
+        { content : Json.Value
+        , eventType : String
+        , roomId : String
+        , stateKey : String
+        , toMsg : Msg -> msg
+        }
+    -> Cmd msg
+sendStateEvent env data =
+    ITask.run
+        data.toMsg
+        (ITask.sendStateEvent
+            { content = data.content
+            , eventType = data.eventType
+            , roomId = data.roomId
+            , stateKey = data.stateKey
+            }
+        )
+        (Context.apiFormat env.context)
+
+
 {-| Sync with the Matrix API to stay up-to-date.
 -}
 sync :
diff --git a/src/Internal/Api/SendStateEvent/Api.elm b/src/Internal/Api/SendStateEvent/Api.elm
new file mode 100644
index 0000000..f69e377
--- /dev/null
+++ b/src/Internal/Api/SendStateEvent/Api.elm
@@ -0,0 +1,177 @@
+module Internal.Api.SendStateEvent.Api exposing (..)
+
+{-|
+
+
+# Send state event
+
+This module sends state events to Matrix rooms.
+
+@docs Phantom, sendStateEvent
+
+-}
+
+import Internal.Api.Api as A
+import Internal.Api.Invite.Api exposing (Phantom)
+import Internal.Api.Request as R
+import Internal.Config.Log exposing (log)
+import Internal.Config.Text as Text
+import Internal.Tools.Json as Json
+import Internal.Values.Envelope as E
+
+
+{-| Send a state event to a Matrix room.
+-}
+sendStateEvent : SendStateEventInput -> A.TaskChain (Phantom a) (Phantom a)
+sendStateEvent =
+    A.startWithVersion "r0.0.0" sendStateEventV1
+        |> A.sameForVersion "r0.0.1"
+        |> A.sameForVersion "r0.1.0"
+        |> A.sameForVersion "r0.2.0"
+        |> A.sameForVersion "r0.3.0"
+        |> A.sameForVersion "r0.4.0"
+        |> A.sameForVersion "r0.5.0"
+        |> A.sameForVersion "r0.6.0"
+        |> A.forVersion "r0.6.1" sendStateEventV2
+        |> A.forVersion "v1.1" sendStateEventV3
+        |> A.sameForVersion "v1.2"
+        |> A.sameForVersion "v1.3"
+        |> A.sameForVersion "v1.4"
+        |> A.sameForVersion "v1.5"
+        |> A.sameForVersion "v1.6"
+        |> A.sameForVersion "v1.7"
+        |> A.sameForVersion "v1.8"
+        |> A.sameForVersion "v1.9"
+        |> A.sameForVersion "v1.10"
+        |> A.sameForVersion "v1.11"
+        |> A.versionChain
+
+
+{-| Context needed for sending a state event
+-}
+type alias Phantom a =
+    { a | accessToken : (), baseUrl : (), versions : () }
+
+
+type alias PhantomV1 a =
+    { a | accessToken : (), baseUrl : () }
+
+
+type alias SendStateEventInput =
+    { content : Json.Value
+    , eventType : String
+    , roomId : String
+    , stateKey : String
+    }
+
+
+type alias SendStateEventInputV1 a =
+    { a
+        | content : Json.Value
+        , eventType : String
+        , roomId : String
+        , stateKey : String
+    }
+
+
+type alias SendStateEventOutputV1 =
+    { eventId : Maybe String }
+
+
+type alias SendStateEventOutputV2 =
+    { eventId : String }
+
+
+sendStateEventV1 : SendStateEventInputV1 i -> A.TaskChain (PhantomV1 a) (PhantomV1 a)
+sendStateEventV1 { content, eventType, roomId, stateKey } =
+    A.request
+        { attributes = [ R.accessToken, R.fullBody content ]
+        , coder = coderV1
+        , contextChange = always identity
+        , method = "PUT"
+        , path = [ "_matrix", "client", "r0", "rooms", roomId, "state", eventType, stateKey ]
+        , toUpdate =
+            \out ->
+                ( E.More []
+                , out.eventId
+                    |> Text.logs.sendEvent
+                    |> log.debug
+                    |> List.singleton
+                )
+        }
+
+
+sendStateEventV2 : SendStateEventInputV1 i -> A.TaskChain (PhantomV1 a) (PhantomV1 a)
+sendStateEventV2 { content, eventType, roomId, stateKey } =
+    A.request
+        { attributes = [ R.accessToken, R.fullBody content ]
+        , coder = coderV2
+        , contextChange = always identity
+        , method = "PUT"
+        , path = [ "_matrix", "client", "r0", "rooms", roomId, "state", eventType, stateKey ]
+        , toUpdate =
+            \out ->
+                ( E.More []
+                , out.eventId
+                    |> Maybe.Just
+                    |> Text.logs.sendEvent
+                    |> log.debug
+                    |> List.singleton
+                )
+        }
+
+
+sendStateEventV3 : SendStateEventInputV1 i -> A.TaskChain (PhantomV1 a) (PhantomV1 a)
+sendStateEventV3 { content, eventType, roomId, stateKey } =
+    A.request
+        { attributes = [ R.accessToken, R.fullBody content ]
+        , coder = coderV2
+        , contextChange = always identity
+        , method = "PUT"
+        , path = [ "_matrix", "client", "v3", "rooms", roomId, "state", eventType, stateKey ]
+        , toUpdate =
+            \out ->
+                ( E.More []
+                , out.eventId
+                    |> Maybe.Just
+                    |> Text.logs.sendEvent
+                    |> log.debug
+                    |> List.singleton
+                )
+        }
+
+
+coderV1 : Json.Coder SendStateEventOutputV1
+coderV1 =
+    Json.object1
+        { name = "EventResponse"
+        , description =
+            [ "This object is returned after a state event has been sent."
+            ]
+        , init = SendStateEventOutputV1
+        }
+        (Json.field.optional.value
+            { fieldName = "event_id"
+            , toField = .eventId
+            , description = [ "A unique identifier for the event." ]
+            , coder = Json.string
+            }
+        )
+
+
+coderV2 : Json.Coder SendStateEventOutputV2
+coderV2 =
+    Json.object1
+        { name = "EventResponse"
+        , description =
+            [ "This object is returned after a state event has been sent."
+            ]
+        , init = SendStateEventOutputV2
+        }
+        (Json.field.required
+            { fieldName = "event_id"
+            , toField = .eventId
+            , description = [ "A unique identifier for the event." ]
+            , coder = Json.string
+            }
+        )
diff --git a/src/Internal/Api/Task.elm b/src/Internal/Api/Task.elm
index 43d3845..8d4c741 100644
--- a/src/Internal/Api/Task.elm
+++ b/src/Internal/Api/Task.elm
@@ -1,6 +1,6 @@
 module Internal.Api.Task exposing
     ( Task, run, Backpack
-    , sendMessageEvent, sync
+    , sendMessageEvent, sendStateEvent, sync
     )
 
 {-|
@@ -23,7 +23,7 @@ up-to-date.
 
 ## Tasks
 
-@docs sendMessageEvent, sync
+@docs sendMessageEvent, sendStateEvent, sync
 
 -}
 
@@ -33,6 +33,7 @@ import Internal.Api.LoginWithUsernameAndPassword.Api
 import Internal.Api.Now.Api
 import Internal.Api.Request as Request
 import Internal.Api.SendMessageEvent.Api
+import Internal.Api.SendStateEvent.Api
 import Internal.Api.Sync.Api
 import Internal.Api.Versions.Api
 import Internal.Config.Log exposing (Log, log)
@@ -232,6 +233,15 @@ sendMessageEvent input =
         |> finishTask
 
 
+{-| Send a state event to a room.
+-}
+sendStateEvent : { content : Json.Value, eventType : String, roomId : String, stateKey : String } -> Task
+sendStateEvent input =
+    makeVBA
+        |> C.andThen (Internal.Api.SendStateEvent.Api.sendStateEvent input)
+        |> finishTask
+
+
 {-| Sync with the Matrix API to stay up-to-date.
 -}
 sync : { fullState : Maybe Bool, presence : Maybe String, since : Maybe String, timeout : Maybe Int } -> Task
diff --git a/src/Matrix/Room.elm b/src/Matrix/Room.elm
index 5909c70..8feff52 100644
--- a/src/Matrix/Room.elm
+++ b/src/Matrix/Room.elm
@@ -1,7 +1,7 @@
 module Matrix.Room exposing
     ( Room, mostRecentEvents, roomId
     , getAccountData
-    , sendMessageEvent
+    , sendMessageEvent, sendStateEvent
     )
 
 {-|
@@ -44,7 +44,7 @@ room. These events are JSON objects that can be shaped in any way or form that
 you like. To help other users with decoding your JSON objects, you pass an
 `eventType` string which helps them figure out the nature of your JSON object.
 
-@docs sendMessageEvent
+@docs sendMessageEvent, sendStateEvent
 
 -}
 
@@ -104,3 +104,25 @@ sendMessageEvent data =
                 , toMsg = Types.VaultUpdate >> data.toMsg
                 , transactionId = data.transactionId
                 }
+
+
+{-| Send a state event to a given room.
+-}
+sendStateEvent :
+    { content : E.Value
+    , eventType : String
+    , room : Room
+    , stateKey : String
+    , toMsg : Types.VaultUpdate -> msg
+    }
+    -> Cmd msg
+sendStateEvent data =
+    case data.room of
+        Room room ->
+            Api.sendStateEvent room
+                { content = data.content
+                , eventType = data.eventType
+                , roomId = roomId data.room
+                , stateKey = data.stateKey
+                , toMsg = Types.VaultUpdate >> data.toMsg
+                }