Billings Mill Brook (also known as Mill Brook or Billings Mill Creek) is a tributary of Tunkhannock Creek in Wyoming County, Pennsylvania, in the United States. It is approximately 3.5 miles (5.6 km) long and flows through Lemon Township and Tunkhannock Township. The watershed of the stream has an area of 12.7 square miles (33 km2). The stream has one named tributary, which is known as Kern Glen Creek. The surficial geology in the vicinity of Billings Mill Brook mainly consists of Wisconsinan Till, alluvium, and several others. A lake known as Lake Carey is in the stream's watershed. A number of bridges have also been constructed over Billings Mill Brook. The stream's watershed is designated as a Coldwater Fishery and a Migratory Fishery.