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
See also Mill Creek (disambiguation) Millbrook (disambiguation)