Millbrook Township is a township in Graham County, Kansas, United States.

Millbrook Township covers an area of 61.59 square miles (159.5 km2) and contains no incorporated settlements.

According to the USGS, it contains two cemeteries: Brush Creek and Penokee.

The streams of Brush Creek and Jackson Branch run through this township.

This article about a location in Graham County, Kansas is a stub.