Swift Dam () is a dam in Pondera County, Montana, United States, on the southern end of the Blackfeet Indian Reservation.
The dam at was originally constructed around 1910, with a height of . The embankment structure gave way on June 10, 1964, after heavy rains caused flooding on Birch Creek. The dam collapsed and sent a wall of water down the creek bed. The nearby dam at Lower Two Medicine Lake also failed, and at least 28 people were killed.
The current concrete-arch structure was completed in 1967, with a height of , and a length at its crest of . The reservoir is also contained by a secondary earthen dike () with a height of and a length of , also completed in 1967. The dams and reservoir are owned and operated by the local Pondera Canal & Reservoir Company.
The reservoir, Swift Reservoir, has a maximum storage capacity of , normal storage of , and a normal elevation of . Recreation is restricted to hiking in the area, with a parking area that requires Blackfeet Nation permission.