Louis Clark Brock (June 18, 1939 – September 6, 2020) was an American professional baseball outfielder. He began his 19-year Major League Baseball (MLB) career with the 1961 Chicago Cubs but spent the majority of his big league career as a left fielder for the St. Louis Cardinals. Brock was inducted into the National Baseball Hall of Fame in 1985 and the St. Louis Cardinals Hall of Fame in 2014. He was a special instructor coach for the St. Louis Cardinals.
Brock was best known for his base stealing, breaking Ty Cobb's all-time major league career steals record and Maury Wills's single-season record. Brock was an All-Star for six seasons and a National League (NL) stolen base leader for eight seasons. He led the NL in doubles and triples in 1968. He also led the NL in singles in 1972, and was the runner-up for the NL Most Valuable Player Award in 1974.
He is also known as Louis Clark "Lou" Brock and Louis Clark Brock.