Robbinsville Township is a township in Mercer County, New Jersey, United States. What is now Robbinsville Township was originally incorporated as Washington Township (named for George Washington) by an act of the New Jersey Legislature on March 15, 1859, from portions of East Windsor Township. On November 6, 2007, voters approved by a vote of 1,816 to 693 a measure that changed the township's name from Washington Township (the name of five other municipalities in New Jersey) to Robbinsville, named after a settlement within the township.