Leirfjorden is a fjord in the municipalities of Leirfjord and Alstahaug in Nordland county, Norway. The long fjord is located east of the town of Sandnessjøen, between the mainland and the island of Alsta. There is a short strait that connects it to the Vefsnfjorden to the south.

Leirfjorden is a fjord in the municipalities of Leirfjord and Alstahaug in Nordland county, Norway. The long fjord is located east of the town of Sandnessjøen, between the mainland and the island of Alsta. There is a short strait that connects it to the Vefsnfjorden to the south.