diff --git a/src/SlashCommands.js b/src/SlashCommands.js
new file mode 100644
index 00000000..e24de861
--- /dev/null
+++ b/src/SlashCommands.js
@@ -0,0 +1,192 @@
+/*
+Copyright 2015 OpenMarket Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+'use strict';
+
+var MatrixClientPeg = require("./MatrixClientPeg");
+var dis = require("./dispatcher");
+
+var reject = function(msg) {
+    return {
+        error: msg
+    };
+};
+
+var success = function(promise) {
+    return {
+        promise: promise
+    };
+};
+
+var commands = {
+    // Change your nickname
+    nick: function(room_id, args) {
+        if (args) {
+            return MatrixClientPeg.get().setDisplayName(args);
+        }
+        return reject("Usage: /nick <display_name>");
+    },
+
+    // Invite a user
+    invite: function(room_id, args) {
+        if (args) {
+            var matches = args.match(/^(\S+)$/);
+            if (matches) {
+                return success(
+                    MatrixClientPeg.get().invite(room_id, matches[1])
+                );
+            }
+        }
+        return reject("Usage: /invite <userId>");
+    },
+
+    // Join a room
+    join: function(room_id, args) {
+        if (args) {
+            var matches = args.match(/^(\S+)$/);
+            if (matches) {
+                var room_alias = matches[1];
+                // TODO: 
+                // Map alias to room ID
+                // Find the room (if joined, then just view the room)
+                // else join the room alias
+                /*
+                dis.dispatch({
+                    action: 'view_room',
+                    room_id: roomId
+                }); */
+            }
+        }
+        return reject("Usage: /join <room_alias> [NOT IMPLEMENTED]");
+    },
+
+    // Kick a user from the room with an optional reason
+    kick: function(room_id, args) {
+        if (args) {
+            var matches = args.match(/^(\S+?)( +(.*))?$/);
+            if (matches) {
+                return success(
+                    MatrixClientPeg.get().kick(room_id, matches[1], matches[3])
+                );
+            }
+        }
+        return reject("Usage: /kick <userId> [<reason>]");
+    },
+
+    // Ban a user from the room with an optional reason
+    ban: function(room_id, args) {
+        if (args) {
+            var matches = args.match(/^(\S+?)( +(.*))?$/);
+            if (matches) {
+                return success(
+                    MatrixClientPeg.get().ban(room_id, matches[1], matches[3])
+                );
+            }
+        }
+        return reject("Usage: /ban <userId> [<reason>]");
+    },
+
+    // Unban a user from the room
+    unban: function(room_id, args) {
+        if (args) {
+            var matches = args.match(/^(\S+)$/);
+            if (matches) {
+                // Reset the user membership to "leave" to unban him
+                return success(
+                    MatrixClientPeg.get().unban(room_id, matches[1])
+                );
+            }
+        }
+        return reject("Usage: /unban <userId>");
+    },
+
+    // Define the power level of a user
+    op: function(room_id, args) {
+        if (args) {
+            var matches = args.match(/^(\S+?)( +(\d+))?$/);
+            var powerLevel = 50; // default power level for op
+            if (matches) {
+                var user_id = matches[1];
+                if (matches.length === 4 && undefined !== matches[3]) {
+                    powerLevel = parseInt(matches[3]);
+                }
+                if (powerLevel !== NaN) {
+                    var room = MatrixClientPeg.get().getRoom(room_id);
+                    if (!room) {
+                        return reject("Bad room ID: " + room_id);
+                    }
+                    var powerLevelEvent = room.currentState.getStateEvents(
+                        "m.room.power_levels", ""
+                    );
+                    return success(
+                        MatrixClientPeg.get().setPowerLevel(
+                            room_id, user_id, powerLevel, powerLevelEvent
+                        )
+                    );
+                }
+            }
+        }
+        return reject("Usage: /op <userId> [<power level>]");
+    },
+
+    // Reset the power level of a user
+    deop: function(room_id, args) {
+        if (args) {
+            var matches = args.match(/^(\S+)$/);
+            if (matches) {
+                var room = MatrixClientPeg.get().getRoom(room_id);
+                if (!room) {
+                    return reject("Bad room ID: " + room_id);
+                }
+
+                var powerLevelEvent = room.currentState.getStateEvents(
+                    "m.room.power_levels", ""
+                );
+                return success(
+                    MatrixClientPeg.get().setPowerLevel(
+                        room_id, args, undefined, powerLevelEvent
+                    )
+                );
+            }
+        }
+        return reject("Usage: /deop <userId>");
+    }
+};
+
+module.exports = {
+    /**
+     * Process the given text for /commands and perform them.
+     * @param {string} roomId The room in which the command was performed.
+     * @param {string} input The raw text input by the user.
+     * @return {Object|null} An object with the property 'error' if there was an error
+     * processing the command, or 'promise' if a request was sent out.
+     * Returns null if the input didn't match a command.
+     */
+    processInput: function(roomId, input) {
+        // trim any trailing whitespace, as it can confuse the parser for 
+        // IRC-style commands
+        input = input.replace(/\s+$/, "");
+        if (input[0] === "/" && input[1] !== "/") {
+            var bits = input.match(/^(\S+?)( +(.*))?$/);
+            var cmd = bits[1].substring(1).toLowerCase();
+            var args = bits[3];
+            if (commands[cmd]) {
+                return commands[cmd](roomId, args);
+            }
+        }
+        return null; // not a command
+    }
+};
\ No newline at end of file
diff --git a/src/controllers/molecules/MessageComposer.js b/src/controllers/molecules/MessageComposer.js
index 38d4a4f4..db1f4550 100644
--- a/src/controllers/molecules/MessageComposer.js
+++ b/src/controllers/molecules/MessageComposer.js
@@ -17,6 +17,7 @@ limitations under the License.
 'use strict';
 
 var MatrixClientPeg = require("../../MatrixClientPeg");
+var SlashCommands = require("../../SlashCommands");
 
 var dis = require("../../dispatcher");
 var KeyCode = {
@@ -171,6 +172,25 @@ module.exports = {
 
     onEnter: function(ev) {
         var contentText = this.refs.textarea.getDOMNode().value;
+
+        var cmd = SlashCommands.processInput(this.props.room.roomId, contentText);
+        if (cmd) {
+            ev.preventDefault();
+            if (cmd.promise) {
+                cmd.promise.done(function() {
+                    console.log("Command success.");
+                }, function(err) {
+                    console.error("Command failure: %s", err);
+                });
+                this.refs.textarea.getDOMNode().value = '';
+            }
+            else if (cmd.error) {
+                console.error(cmd.error);
+            }
+
+            return;
+        }
+
         var content = null;
         if (/^\/me /i.test(contentText)) {
             content = {