Newtown Creek is a tributary, rising near Stoop Road in Newtown Township, Bucks County, Pennsylvania, United States. It is part of the Delaware River watershed and is located entirely in Bucks County, Pennsylvania. The Newtown Creek Bridge over Centre Avenue was added to the National Register of Historic Places in 1988.
Newtown Creek rises near Stoopville Road east of Pennsylvania Route 413, flows generally in a southerly direction to its confluence at the Neshaminy Creek's 16.1 river mile passing along the western side of Newtown Borough. Its watershed is approximately .
Newtown Creek has one unnamed tributary on the left bank near Wright's Road.
Newtown Creek rises in the Lockatong Formation, sedimentary rock deposited during the Upper Triassic. Mineralogy includes argillite, shale, some limestone and calcareous shale.