Dartmouth (Massachusett: Apponeganset) is a coastal town in Bristol County, Massachusetts, United States. Old Dartmouth was the first area of Southeastern Massachusetts to be settled by Europeans in 1652, primarily English. Dartmouth is part of New England's farm coast, which consists of a chain of historic coastal villages, vineyards, and farms. June 8, 2014, marked the 350th year of Dartmouth's incorporation as a town. It is also part of the Massachusetts South Coast.

The northern part of Dartmouth hosts the town's large commercial districts. The southern part of town abuts Buzzards Bay, and there are several other waterways, including Lake Noquochoke, Cornell Pond, Slocums River, Shingle Island River and Paskamansett River. The town has several working farms and one vineyard, which is part of the Coastal Wine Tour. With a thriving agricultural heritage, the town and state have protected many of the working farms.

The southern part of Dartmouth borders Buzzards Bay, where a lively fishing and boating community thrives; off its coast, the Elizabeth Islands and Cuttyhunk can be seen. The New Bedford Yacht Club in Padanaram hosts a bi-annual regatta. It has been a destination for generations as a summer community. Notable affluent sections within South Dartmouth are Nonquitt, Round Hill, Barney's Joy, and Mishaum Point. As of the 2020 census, the year-round population of Dartmouth was 33,783.