Fitchburg is a city in northern Worcester County, Massachusetts, United States. The third-largest city in the county, its population was 40,318 at the 2010 census. Fitchburg is home to Fitchburg State University as well as 17 public and private elementary and high schools.
Fitchburg was first settled in by Europeans in 1730 as part of Lunenburg, and was officially set apart from that town and incorporated in 1764. The area was previously occupied by the Nimpuc tribe. It is named for John Fitch, one of the committee that procured the act of incorporation. In July 1748 Fitch and his family, living in this isolated spot, were abducted to Canada by Native Americans, but returned the next year.
Fitchburg is situated on both the Nashua River and a railroad line. The original Fitchburg Railroad ran through the Hoosac Tunnel, linking Boston and Albany, New York. The tunnel was built using the Burleigh Rock Drill, designed and built in Fitchburg. Fitchburg was a 19th-century industrial center.