Monongahela or Mon Valley may refer to:

• Monongahela, Pennsylvania, a city in Washington County
  • Monongahela Cemetery, a historic cemetery in Monongahela City, Pennsylvania
  • Monongahela City Bridge, spans the Monongahela River
• Monongahela National Forest, a national forest in eastern West Virginia
• Monongahela River, a tributary of the Ohio River
  • Battle of the Monongahela (9 July 1755), at the beginning of the French and Indian War
• Lake Monongahela, former Proglacial lake in Pennsylvania, West Virginia, and Ohio
• Monongahela Formation, a geologic group

• Monongahela Railway, a coal-hauling short line railroad in Pennsylvania and West Virginia in the United States
• Monongahela Connecting Railroad, a small industrial railroad in Pittsburgh, Pennsylvania
• Monongahela Freight Incline, a funicular railway that scaled Mount Washington
• Monongahela Incline, a funicular located near the Smithfield Street Bridge in Pittsburgh, Pennsylvania

• Monongahela (album), a 1988 album by The Oak Ridge Boys
• Monongahela (fish), a genus of prehistoric fish
• Monongahela virus, an Orthohantavirus
• Monongahela culture, a Native American group
• USS Monongahela, one of various ships of the United States Navy
• the Mon Valley, a variant name of the PATrain commuter rail service
• Monongahela, a whaleship lost in 1853.

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