Spencer is a town in Worcester County, Massachusetts, United States. The population was 11,688 at the 2010 census.
For geographic and demographic information on the census-designated place Spencer, please see the article Spencer (CDP), Massachusetts.
Spencer was first settled in 1717 by Nathaniel Wood, and first permanently settled by Samuel Bemis in 1721. It was officially incorporated on April 12, 1753, splitting from the town of Leicester. Spencer was named after the then-acting governor of Massachusetts, Spencer Phips. Spencer was the home of the Howe family of inventors, including Elias Howe, who perfected the lockstitch sewing machine.