Fortress Mountain may refer to:
- Fortress Mountain (Alaska), 3,053 ft (931 m), Brooks Range, USA
- Fortress Mountain (Gallatin County, Montana), 9,771 ft (2,978 m), Yellowstone Area, USA
- Fortress Mountain (Washington), 8,760 ft (2,670 m), North Cascades, USA. 
- Fortress Mountain (Park County, Wyoming), 12,090 ft (3,690 m), Absaroka Range, USA
- The Fortress (Alberta), 3,007 m (9,865 ft), Canadian Rockies, Canada
|This disambiguation page lists articles about distinct geographical locations with the same name.
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