diff --git a/types/reach__combobox/index.d.ts b/types/reach__combobox/index.d.ts
new file mode 100644
index 0000000000..da90d9541a
--- /dev/null
+++ b/types/reach__combobox/index.d.ts
@@ -0,0 +1,44 @@
+// Type definitions for @reach/combobox 0.1
+// Project: https://github.com/reach/reach-ui
+// Definitions by: Harry Hedger <https://github.com/hedgerh>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.8
+
+import * as React from 'react';
+
+export type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;
+
+export interface ComboboxProps extends Omit<React.HTMLProps<HTMLElement>, 'onSelect'> {
+    children?: React.ReactNode;
+    onSelect?: (value: string) => void;
+    openOnFocus?: boolean;
+    as?: string;
+}
+
+export interface ComboboxInputProps extends React.HTMLProps<HTMLElement> {
+    selectOnClick?: boolean;
+    autocomplete?: boolean;
+    value?: string;
+    as?: string;
+}
+
+export interface ComboboxPopoverProps extends React.HTMLProps<HTMLElement> {
+    portal?: boolean;
+}
+
+export interface ComboboxListProps extends React.HTMLProps<HTMLElement> {
+    persistSelection?: boolean;
+    as?: string;
+}
+
+export interface ComboboxOptionProps extends React.HTMLProps<HTMLElement> {
+    children?: React.ReactNode;
+    value: string;
+}
+
+export const Combobox: React.FC<ComboboxProps>;
+export const ComboboxInput: React.FC<ComboboxInputProps>;
+export const ComboboxPopover: React.FC<ComboboxPopoverProps>;
+export const ComboboxList: React.FC<ComboboxListProps>;
+export const ComboboxOption: React.FC<ComboboxOptionProps>;
+export const ComboboxOptionText: React.FC;
diff --git a/types/reach__combobox/reach__combobox-tests.tsx b/types/reach__combobox/reach__combobox-tests.tsx
new file mode 100644
index 0000000000..97a0fcd563
--- /dev/null
+++ b/types/reach__combobox/reach__combobox-tests.tsx
@@ -0,0 +1,36 @@
+import {
+    Combobox,
+    ComboboxInput,
+    ComboboxPopover,
+    ComboboxList,
+    ComboboxOption,
+    ComboboxOptionText,
+} from '@reach/combobox';
+
+import * as React from 'react';
+import { render } from 'react-dom';
+
+const GoodExample = () => (
+    <Combobox>
+        <ComboboxInput aria-labelledby="demo" />
+        <ComboboxPopover>
+            <ComboboxList aria-labelledby="demo">
+                <ComboboxOption value="Apple" />
+                <ComboboxOption value="Banana" />
+                <ComboboxOption value="Orange" />
+                <ComboboxOption value="Pineapple" />
+                <ComboboxOption value="Kiwi" />
+            </ComboboxList>
+        </ComboboxPopover>
+    </Combobox>
+);
+
+render(<GoodExample />, document.getElementById('app'));
+render(<Combobox />, document.getElementById('app'));
+render(<ComboboxInput />, document.getElementById('app'));
+render(<ComboboxPopover />, document.getElementById('app'));
+render(<ComboboxList />, document.getElementById('app'));
+render(<ComboboxOptionText />, document.getElementById('app'));
+
+// $ExpectError
+render(<ComboboxOption />, document.getElementById('app'));
diff --git a/types/reach__combobox/tsconfig.json b/types/reach__combobox/tsconfig.json
new file mode 100644
index 0000000000..e4a10c5048
--- /dev/null
+++ b/types/reach__combobox/tsconfig.json
@@ -0,0 +1,28 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "paths": {
+            "@reach/combobox": ["reach__combobox"]
+        },
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "jsx": "react"
+    },
+    "files": [
+        "index.d.ts",
+        "reach__combobox-tests.tsx"
+    ]
+}
diff --git a/types/reach__combobox/tslint.json b/types/reach__combobox/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/reach__combobox/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }