Mill Brook

Mill Brook may refer to:

United Kingdom

 * Mill Brook, Shropshire, a tributary of the River Rea, Shropshire in England

United States

 * Mill Brook (Swift River tributary), a tributary of the Swift River in New Hampshire
 * First River, formerly known as Mill Brook, a tributary of the Passaic River in New Jersey
 * Mill Brook (Pepacton Reservoir tributary), a river in Delaware and Ulster Counties, New York
 * Mill Brook (Unadilla River tributary), a river in Chenango County, New York
 * Mill Brook (West Canada Creek tributary), a river in Herkimer County, New York
 * Mill Brook community, historic community in Vermont