The Fitchburg Historical Society is a historical society whose mission is to collect, preserve, and present the history of Fitchburg, Massachusetts. The society was founded in 1892, and is now headquartered in the historic Phoenix Building at 781 Main Street. The society's original 1912 headquarters building, designed by architect H. M. Francis, was listed on the National Register of Historic Places in 2003.The society operates 3 days a week and is open from 10am to 4pm Mondays and Tuesdays with a longer day on Wednesday from 10am to 6pm. They offer genealogical research, a library of local history, and numerous volunteer opportunities.