The term U.S. Open or US Open is applied to "open" United States-hosted championships in a particular sport (or non-sport organized competitive gaming activity), in which anyone, amateur or professional, American or non-American, may compete. These include:

• U.S. Open (golf), USGA tournament
• US Open (tennis), fourth event of the Grand Slam tournaments
• U.S. Women's Open (golf), LPGA tournament
• U.S. Open Badminton Championships
• U.S. Open (bowling)
• U.S. Open (crosswords)
• U.S. Open (cycling)
• US Open (darts)
• U.S. Open (go), boardgame tournament
• US Open Nine-ball Championship, pool (pocket billiards) tournament
• Lamar Hunt U.S. Open Cup, soccer tournament held between American soccer clubs from MLS, minor leagues, and amateur associations
• U.S. Open (squash)
• U.S. Open (taekwondo), taekwondo tournament of the United States Taekwondo governing body
• U.S. Open (USACO), United States of America Computing Olympiad-proctored programming competition
• U.S. Open Chess Championship
• U.S. Open Rubik's Cube Championship
• U.S. Open (surfing), surfing competition

This article includes a list of sports related pages with the same or similar names. If an internal link for a specific sport article referred you to this page, you may wish to change the link to point directly to the intended sport article, if one exists.