Fitzwilliam is a town in Cheshire County, New Hampshire, United States.

4" in 1752 by colonial Governor Benning Wentworth, this was one in a line of eight towns settled by Scottish colonists.

[3] Two early grantees in Fitzwilliam were Matthew Thornton, signer of the Declaration of Independence, and James Reed, who would lead the 3rd New Hampshire Regiment at Bunker Hill.

[4] Fitzwilliam's picturesque common, together with twelve antique houses that surround it, are listed on the National Register of Historic Places.

[1] Little Monadnock Mountain, elevation 1,883 feet (574 m), is the highest point in Fitzwilliam, located in the western part of town.

The town is drained by the South Branch of the Ashuelot River, the source of which is Bowker Pond.

22.4% of all households were made up of individuals, and 7.4% had someone living alone who was 65 years of age or older.