Lost River may refer to:

• Lost River, New South Wales

• Lost River, Quebec, part of Harrington, Quebec
• Rural Municipality of Lost River No. 313, Saskatchewan

• Lost River, Idaho
• Lost River, Indiana
• Lost River Township, Martin County, Indiana
• Lost River, Kentucky
• Lost River, West Virginia

• Losing stream, a river that decreases in volume as it flows

• In Alaska:
  • Lost River (Bering Sea)
  • Lost River (Nowitna River tributary), a tributary to the Nowitna River
• Lost River (California), in California and Oregon
• Big Lost River, Idaho
• Little Lost River, Idaho
• Lost River (Indiana)
• In Minnesota:
  • Lost River (Clearwater River tributary)
  • Lost River (Nett Lake)
  • Lost River (Roseau River tributary)
  • Lost River (Tamarac River tributary)
  • Lost River (Thief River tributary)
• Lost River (New Hampshire)
• Lost River (Methow River tributary), a tributary to the Methow River
• Lost River (Cacapon River tributary), in West Virginia

• Lost River (film), a 2014 American film directed by Ryan Gosling
• The Lost River, 2014 book by Michel Danino subtitled On The Trail of the Sarasvati
• Lost River Cave, Kentucky
• Lost River Caverns, Pennsylvania
• Lost River State Forest, Minnesota
• Lost River Athletic Conference, a 1970s high school conference in Indiana
• Lost River Jr./Sr. High School, serving Merrill, Oregon

This disambiguation page lists articles associated with the title Lost River.
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