Washington is a town in Sullivan County, New Hampshire, United States.

Granted in 1735 by colonial governor Jonathan Belcher of Massachusetts, the town was one of the fort towns designated to protect the colonies from Native attack, named "Monadnock Number 8".

On December 13, 1776, the newly established American revolutionary government incorporated the town as "Washington", after George Washington—one of the first named in his honor.

Using water power from the streams, mills manufactured lumber, barrel staves, shingles, chair parts, bobbins, whip sockets, hosiery, bricks and washboards.

Tubbs Union Academy was founded in 1849, and although it did not last long, the school once enrolled over 100 students from New Hampshire and beyond.

The railroad era brought tourists, and hotels were built on the lakes and ponds;[citation needed] however, with 19th-century migration to the Midwest, the town's population dwindled.

Bog Brook drains the center of the town from north to south, flowing into Highland Lake near the southern border.

As Edwin A. Charlton writes in New Hampshire As It Is (1855), the mountain "received its name from Captain John Lovewell, who was accustomed to ascend it for the purpose of discovering the wigwams of the Indians, and who, on one occasion, killed seven Indians near its summit."

(The town hall of Clarksville in northern New Hampshire is located at a higher elevation—1,980 feet (600 m)—but there is no other village development there.)