Following is a list of dams and reservoirs in Montana.

All major dams are linked below. The National Inventory of Dams defines any "major dam" as being 50 feet (15 m) tall with a storage capacity of at least 5,000 acre-feet (6,200,000 m³), or of any height with a storage capacity of 25,000 acre-feet (31,000,000 m³).^[1]

Dams and reservoirs in Montana

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• Black Eagle Dam, unnamed reservoir, NorthWestern Energy
• Box Elder Creek Dam, Boxelder Lake, City of Plentywood
• Bynum Reservoir Dam, Bynum Reservoir, Teton Cooperative Reservoir Company
• Canyon Ferry Dam, Canyon Ferry Lake, United States Bureau of Reclamation
• Clark Canyon Dam, Clark Canyon Reservoir, USBR
• Cochrane Dam, unnamed reservoir, NorthWestern Energy
• Como Dam, Como Lake, USBR
• Cooney Dam, Cooney Reservoir, State of Montana
• Fort Peck Dam, Fort Peck Lake, United States Army Corps of Engineers
• Fresno Dam, Fresno Reservoir, USBR
• Gibson Dam, Gibson Reservoir, USBR
• Hauser Dam, Hauser Lake, NorthWestern Energy
• Hebgen Dam, Hebgen Lake, NorthWestern Energy
• Holter Dam, Holter Lake, NorthWestern Energy
• Hungry Horse Dam, Hungry Horse Reservoir, USBR
• Kerr Dam, Flathead Lake, Energy Keepers Inc.
• Kicking Horse Dam, Kicking Horse Reservoir, Bureau of Indian Affairs
• Libby Dam, Lake Koocanusa, USACE
• Lower Two Medicine Dam, Lower Two Medicine Lake, Lake Elwell, Bureau of Indian Affairs
• Madison Dam, Ennis Lake, NorthWestern Energy
• Milltown Dam (removed)
• Morony Dam, unnamed reservoir, NorthWestern Energy
• Mystic Lake Dam, Mystic Lake, NorthWestern Energy
• Noxon Rapids Dam, Noxon Reservoir, Avista
• Rainbow Dam, unnamed reservoir, NorthWestern Energy
• Ryan Dam, unnamed reservoir, NorthWestern Energy
• Lake Sherburne Dam, Lake Sherburne, USBR
• Swift Dam, Swift Reservoir, Pondera County Canal and Reservoir Company
• Thompson Falls Dam, unnamed reservoir, NorthWestern Energy
• Tiber Dam, Lake Elwell, USBR
• Tongue River Dam, Tongue River Reservoir, Montana Department of Natural Resources and Conservation
• Toston Dam, Toston Reservoir, Montana Department of Natural Resources
• Willow Creek Dam, Willow Creek Reservoir, USBR
• Yellowtail Dam, Bighorn Lake, USBR