Beitstadfjorden (Urban East Norwegian: [ˈbæ̂ɪtstɑˌfjuːɳ]) is the innermost arm of the Trondheimsfjord in Trøndelag county, Norway. It is located in the municipalities of Steinkjer, Inderøy, and a small part extends into Indre Fosen. The fjord has a length of 28 kilometres (17 mi) from southwest to northeast, and a width of about 6 to 8 kilometres (3.7 to 5.0 mi).