Harold Warren Moon (born November 18, 1956 in Los Angeles, California) is a former American professional gridiron football quarterback who played for the Canadian Football League's Edmonton Eskimos and the National Football League's Houston Oilers, Minnesota Vikings, Seattle Seahawks and Kansas City Chiefs. He is currently a broadcaster for the Seattle Seahawks.

He is one of only two people to be enshrined in both the Pro Football Hall of Fame and Canadian Football Hall of Fame. (Former coach Bud Grant, who coached the Winnipeg Blue Bombers to four Grey Cup titles and the Minnesota Vikings to four Super Bowl games, is the other.) Moon is the first modern African-American quarterback to be elected to the Pro Football Hall of Fame.

Moon held the record for most passing yardage in professional football until surpassed by Damon Allen on September 4, 2006, held the record for most passing touchdowns in professional football until surpassed by Brett Favre on November 22, 2007, held the record for most pass completions in professional football until surpassed by Brett Favre on December 23, 2007, and held the record for most pass attempts in professional football history until surpassed by Brett Favre on December 14, 2008. Brett Favre has now also passed him for the most fumbles in league history on October 11, 2010.