Curtis Charles Flood Sr. (January 18, 1938 – January 20, 1997) was an American professional baseball center fielder and activist. He played 15 seasons in Major League Baseball (MLB) for the Cincinnati Redlegs, St. Louis Cardinals, and Washington Senators.
Flood was a three-time All-Star, a Gold Glove winner for seven consecutive seasons, and batted over .300 in six seasons. He led the National League (NL) in hits (211) in 1964 and in singles, 1963, 1964, and 1968. Flood also led the National League in putouts as center fielder four times and in fielding percentage as center fielder three times. He retired with the third most games in center field (1683) in NL history, trailing Willie Mays and Richie Ashburn.
Flood became one of the pivotal figures in the sport's labor history when he refused to accept a trade following the 1969 season, ultimately appealing his case to the U.S. Supreme Court. Although his legal challenge was unsuccessful, it brought about additional solidarity among players as they fought against baseball's reserve clause and sought free agency.