The Pomperaug River is a 13.4-mile-long (21.6 km) river in the US state of Connecticut. The two main tributaries to the Pomperaug are the and the ; their confluence forms the Pomperaug and Woodbury developed here. The river flows through Woodbury and the Town of Southbury, where it empties into the Housatonic River at Lake Zoar. The name of the river is from a local Native American language, likely Paugussset. The locality of Pomperaug in Woodbury takes its name from the river. The Pomperaug is the namesake for the nearby Pomperaug High School.