U.S. Open

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, and generally, male or female, may compete.

The term most commonly refers to:
 * U.S. Open (golf)
 * US Open (tennis)

Other uses include (in alphabetical order by sport/game):
 * U.S. Open Badminton Championships
 * U.S. Open Beer Championship
 * U.S. Open (bowling)
 * U.S. Open Chess Championship
 * U.S. Open (crosswords)
 * US Open of Curling
 * U.S. Open (cycling)
 * US Open (darts)
 * U.S. Open (go), boardgame tournament
 * U.S. Women's Open, golf tournament
 * US Open Polo Championship
 * U.S. Open pool championships including:
 * U.S. Open Straight Pool Championship
 * U.S. Open Bank Pool Championship
 * U.S. Open Eight-ball Championship
 * U.S. Open Nine-ball Championship
 * U.S. Open Ten-ball Championship
 * US Open Racquetball Championships
 * U.S. Open Rubik's Cube Championship
 * U.S. Open Cup, soccer tournament held between American soccer clubs from Major League Soccer, minor leagues, and amateur associations
 * U.S. Open Snowboarding
 * U.S. Open (squash)
 * U.S. Open (swimming)
 * U.S. Open of Surfing
 * U.S. Open (table tennis)
 * U.S. Open Track and Field
 * U.S. Open (USACO), United States of America Computing Olympiad-proctored programming competition