Børgin or Borgenfjorden is a fjord branch in the eastern part of Trondheimsfjorden in the municipalities of Steinkjer and Inderøy in Trøndelag county, Norway. The 10-kilometre (6.2 mi) long fjord is about 1 to 3 kilometres wide, although the mouth of the fjord is only 100 metres (330 ft) wide. The mouth of the fjord is by the village of Straumen and there is a bridge across the fjord at its narrowest point.