Tilton Northfield is a census-designated place (CDP) representing two adjacent villages in the towns of Tilton in Belknap County and Northfield in Merrimack County in the U.S. state of New Hampshire.

The CDP encompasses the town centers of both Tilton and Northfield, located on either side of the Winnipesaukee River.

The Northfield part of the CDP is bordered by I-93 to the east; the Winnipesaukee River, Williams Brook and Zion Hill Road to the west; and Forrest Road to the south.

31.4% of all households were made up of individuals, and 10.6% were someone living alone who was 65 years of age or older.

Male full-time workers had a median income of $39,978 versus $34,118 for females.