diff --git a/types/steamid/index.d.ts b/types/steamid/index.d.ts
new file mode 100644
index 0000000000..37967db201
--- /dev/null
+++ b/types/steamid/index.d.ts
@@ -0,0 +1,134 @@
+// Type definitions for steamid 1.1
+// Project: https://github.com/DoctorMcKay/node-steamid
+// Definitions by: My Self <https://github.com/me>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
+
+/**
+ * Render this SteamID into Steam2 textual format
+ * @param newerFormat [newerFormat=false] - true if you want to use 1 in place of the leading 0 for the public universe
+ */
+type getSteam2RenderedID = (newerFormat?: boolean) => string;
+
+/**
+ * Render this SteamID into Steam3 textual format
+ */
+type getSteam3RenderedID = () => string;
+
+/**
+ * Render this SteamID into 64-bit numeric format
+ */
+type getSteamID64 = () => string;
+
+declare class SteamID {
+    universe: SteamID.Universe;
+    type: SteamID.Type;
+    instance: SteamID.Instance;
+    accountid: number;
+
+    /**
+     * You can create a SteamID object from a Steam2 rendered ID, a Steam3 rendered ID, a SteamID64, or from the four parts that make up a SteamID.
+     * @param input SteamID string
+     */
+    constructor(input: string);
+
+    /**
+     * Check whether this SteamID is valid (according to Steam's rules)
+     */
+    isValid(): boolean;
+
+    /**
+     * Check whether this chat SteamID is tied to a Steam group.
+     */
+    isGroupChat(): boolean;
+
+    /**
+     * Check whether this chat SteamID is a Steam lobby.
+     */
+    isLobby(): boolean;
+
+    getSteam2RenderedID: getSteam2RenderedID;
+    steam2: getSteam2RenderedID;
+
+    getSteam3RenderedID: getSteam3RenderedID;
+    steam3: getSteam3RenderedID;
+
+    getSteamID64: getSteamID64;
+    toString: getSteamID64;
+}
+
+declare namespace SteamID {
+    // Universe constants
+    enum Universe {
+        INVALID = 0,
+        PUBLIC = 1,
+        BETA = 2,
+        INTERNAL = 3,
+        DEV = 4,
+    }
+
+    // Type constants
+    enum Type {
+        INVALID = 0,
+        INDIVIDUAL = 1,
+        MULTISEAT = 2,
+        GAMESERVER = 3,
+        ANON_GAMESERVER = 4,
+        PENDING = 5,
+        CONTENT_SERVER = 6,
+        CLAN = 7,
+        CHAT = 8,
+        P2P_SUPER_SEEDER = 9,
+        ANON_USER = 10,
+    }
+
+    // Instance constants
+    enum Instance {
+        ALL = 0,
+        DESKTOP = 1,
+        CONSOLE = 2,
+        WEB = 4,
+    }
+
+    // Type chars
+    enum TypeChars {
+        I = Type.INVALID,
+        U = Type.INDIVIDUAL,
+        M = Type.MULTISEAT,
+        G = Type.GAMESERVER,
+        A = Type.ANON_GAMESERVER,
+        P = Type.PENDING,
+        C = Type.CONTENT_SERVER,
+        g = Type.CLAN,
+        T = Type.CHAT,
+        a = Type.ANON_USER,
+    }
+
+    const AccountIDMask = 0xFFFFFFFF;
+    const AccountInstanceMask = 0x000FFFFF;
+
+    enum ChatInstanceFlags {
+        /**
+         * (AccountInstanceMask + 1) >> 1
+         */
+        Clan = (0x000FFFFF + 1) >> 1,
+
+        /**
+         * (AccountInstanceMask + 1) >> 2
+         */
+        Lobby = (0x000FFFFF + 1) >> 2,
+
+        /**
+         * (AccountInstanceMask + 1) >> 3
+         */
+        MMSLobby = (0x000FFFFF + 1) >> 3,
+    }
+
+    /**
+     * Create an individual SteamID in the public universe given an accountid
+     * @param accountid - The user's account ID
+     */
+    function fromIndividualAccountID(accountid: number | string): SteamID;
+}
+
+export = SteamID;
diff --git a/types/steamid/steamid-tests.ts b/types/steamid/steamid-tests.ts
new file mode 100644
index 0000000000..bbf556c100
--- /dev/null
+++ b/types/steamid/steamid-tests.ts
@@ -0,0 +1,19 @@
+import SteamID = require("steamid");
+
+let sid: SteamID;
+
+sid = new SteamID("76561198006409530");
+sid = SteamID.fromIndividualAccountID(46143802);
+
+sid.universe = SteamID.Universe.PUBLIC;
+sid.type = SteamID.Type.INDIVIDUAL;
+sid.instance = SteamID.Instance.DESKTOP;
+sid.accountid = 46143802;
+
+sid.isValid();
+sid.isGroupChat();
+sid.isLobby();
+sid.getSteam2RenderedID();
+sid.getSteam2RenderedID(true);
+sid.getSteam3RenderedID();
+sid.getSteamID64();
diff --git a/types/steamid/tsconfig.json b/types/steamid/tsconfig.json
new file mode 100644
index 0000000000..dca75b64b2
--- /dev/null
+++ b/types/steamid/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "steamid-tests.ts"
+    ]
+}
diff --git a/types/steamid/tslint.json b/types/steamid/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/steamid/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }