diff --git a/types/catbox-memory/catbox-memory-tests.ts b/types/catbox-memory/catbox-memory-tests.ts
new file mode 100644
index 0000000000..9c4c1bcdfe
--- /dev/null
+++ b/types/catbox-memory/catbox-memory-tests.ts
@@ -0,0 +1,8 @@
+import * as CatboxMemory from 'catbox-memory';
+
+const client = new CatboxMemory<string>({
+    allowMixedContent: true,
+    cloneBuffersOnGet: false,
+    maxByteSize: 1024,
+    minCleanupIntervalMsec: 1000,
+});
diff --git a/types/catbox-memory/index.d.ts b/types/catbox-memory/index.d.ts
new file mode 100644
index 0000000000..b615d6c45d
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+++ b/types/catbox-memory/index.d.ts
@@ -0,0 +1,47 @@
+// Type definitions for catbox-memory 4.0
+// Project: https://github.com/hapijs/catbox-memory#readme
+// Definitions by: Simon Schick <https://github.com/SimonSchick>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.8
+
+import { ClientApi } from 'catbox';
+
+interface CatboxMemory<T> extends ClientApi<T> {}
+
+// tslint:disable-next-line:no-unnecessary-class
+declare class CatboxMemory<T> implements ClientApi<T> {
+    constructor(options?: CatboxMemory.Options);
+}
+
+declare namespace CatboxMemory {
+    interface Options {
+        /**
+         * Sets an upper limit on the number of bytes that can be stored in the cache.
+         * Once this limit is reached no additional items will be added to the cache until some expire.
+         * The utilized memory calculation is a rough approximation and must not be relied on.
+         * @default 104857600 (100MB).
+         */
+        maxByteSize?: number;
+        /**
+         * The minimum number of milliseconds in between each cache cleanup.
+         * @default 1000 (1 second)
+         */
+        minCleanupIntervalMsec?: number;
+        /**
+         * by default, all data is cached as JSON strings, and converted to an object using JSON.parse() on retrieval.
+         * By setting this option to true, Buffer data can be stored alongside the stringified data.
+         * Buffers are not stringified, and are copied before storage to prevent the value from changing while in the cache.
+         * @default false
+         */
+        allowMixedContent?: boolean;
+        /**
+         * by default, buffers stored in the cache with allowMixedContent set to true are copied when they are set but not when they are retrieved.
+         * This means a change to the buffer returned by a get() will change the value in the cache. To prevent this,
+         * set cloneBuffersOnGet to true to always return a copy of the cached buffer.
+         * @default false
+         */
+        cloneBuffersOnGet?: boolean;
+    }
+}
+
+export = CatboxMemory;
diff --git a/types/catbox-memory/tsconfig.json b/types/catbox-memory/tsconfig.json
new file mode 100644
index 0000000000..c52e660d39
--- /dev/null
+++ b/types/catbox-memory/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",
+        "catbox-memory-tests.ts"
+    ]
+}
diff --git a/types/catbox-memory/tslint.json b/types/catbox-memory/tslint.json
new file mode 100644
index 0000000000..f93cf8562a
--- /dev/null
+++ b/types/catbox-memory/tslint.json
@@ -0,0 +1,3 @@
+{
+    "extends": "dtslint/dt.json"
+}