Nothe Fort is a fort in Weymouth, Dorset, England, situated at the end of the Nothe Peninsula, which juts eastwards from the town of Weymouth, and Weymouth Harbour, into the sea to the north of the ex-military Portland Harbour. The fort is located next to Nothe Gardens.

Weymouth is a sea-side town and civil parish in the Dorset district, in the ceremonial county of Dorset, on the English Channel coast of England. Situated on a sheltered bay at the mouth of the River Wey, 11 km (7 mi) south of the county town of Dorchester, Weymouth had a population of 53,427 in 2021. It is the third-largest settlement in Dorset after Bournemouth and Poole. The greater Weymouth urban area has a population of 72,802.