diff --git a/osu.Game/Online/API/Requests/CommentPostRequest.cs b/osu.Game/Online/API/Requests/CommentPostRequest.cs
new file mode 100644
index 0000000000..bd69c04bed
--- /dev/null
+++ b/osu.Game/Online/API/Requests/CommentPostRequest.cs
@@ -0,0 +1,41 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Net.Http;
+using osu.Framework.IO.Network;
+using osu.Game.Online.API.Requests.Responses;
+
+namespace osu.Game.Online.API.Requests
+{
+    public class CommentPostRequest : APIRequest<CommentBundle>
+    {
+        public readonly CommentableType Commentable;
+        public readonly long CommentableId;
+        public readonly string Message;
+        public readonly long? ReplyTo;
+
+        public CommentPostRequest(CommentableType commentable, long commentableId, string message, long? replyTo = null)
+        {
+            Commentable = commentable;
+            CommentableId = commentableId;
+            Message = message;
+            ReplyTo = replyTo;
+        }
+
+        protected override WebRequest CreateWebRequest()
+        {
+            var req = base.CreateWebRequest();
+            req.Method = HttpMethod.Post;
+
+            req.AddParameter(@"comment[commentable_type]", Commentable.ToString());
+            req.AddParameter(@"comment[commentable_id]", $"{CommentableId}");
+            req.AddParameter(@"comment[message]", Message);
+            if (ReplyTo.HasValue)
+                req.AddParameter(@"comment[parent_id]", $"{ReplyTo}");
+
+            return req;
+        }
+
+        protected override string Target => "comments";
+    }
+}