Monongahela may refer to:
- Monongahela, Pennsylvania
- Monongahela National Forest
- Monongahela (album), a 1988 album by The Oak Ridge Boys
- Monongahela (lungfish), a genus of fish
- Monongahela River, a waterway
- Monongahela tribe, a Native American group
- USS Monongahela, one of various ships of the United States Navy
- Monongahela, a rye whiskey from Monongahela, Pennsylvania made prior to prohibition
- Monongahela Railway
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