In Major League Baseball (MLB), the 30–30 club is the group of 47 batters who have collected 30 home runs and 30 stolen bases in a single season. Baseball Digest called the 30–30 club "the most celebrated feat that can be achieved by a player who has both power and speed." Six members have been elected to the National Baseball Hall of Fame. Ken Williams was the first to achieve this, in 1922. He remained the sole member of the club for 34 years until Willie Mays achieved consecutive 30–30 seasons in 1956 and 1957. Bobby Bonds became the club's fourth member in 1969; he subsequently became the first player to achieve the mark in three, four, and five seasons. His son Barry Bonds is the only other player with five 30–30 seasons. In all, 47 players have reached the 30–30 club; 16 have done so more than once. Of these 47, 31 were right-handed batters, 10 were left-handed and six were switch hitters who could bat from either side of the plate. Bobby Witt Jr. of the Kansas City Royals is the only shortstop to achieve multiple 30–30 seasons, reaching this milestone in both 2023, with 30 home runs and 49 stolen bases, and in 2024, with 32 home runs and 31 stolen bases; he's also the only Royals player in the 30–30 club. New York Mets shortstop Francisco Lindor came close to achieving two 30–30 seasons, first reaching the milestone in 2023 with 31 home runs and 31 stolen bases, and then falling just 1 stolen base short in 2024, with 33 home runs and 29 stolen bases. Ten of the 47 players (including five active members of the 30–30 club) have played for only one major league team. The New York Mets are the only franchise to have four players reach the milestone. The Atlanta Braves, Cincinnati Reds, Cleveland Indians, Colorado Rockies, Los Angeles Dodgers, and San Francisco Giants each have had three players reach the milestone. Five players – Hank Aaron, Barry Bonds, Willie Mays, Alex Rodriguez and Sammy Sosa – are also members of the 500-home-run club, and Aaron, Mays and Rodriguez are also members of the 3,000-hit club. Dale Murphy, Jose Canseco, Barry Bonds, Larry Walker, Jimmy Rollins, Ryan Braun, Mookie Betts, and Ronald Acuña Jr. won the Most Valuable Player (MVP) Award in the same year as their 30–30 season; Bonds did so twice, in 1990 and 1992. Mays and Rollins also reached the 20–20–20 club in the same season. A single season has seen as many as five players accomplish 30-30; this happened in 1987, 1996, 1997, 2011, and 2023. The feat has been twice been accomplished by teammates: Darryl Strawberry and Howard Johnson (baseball) for the New York Mets in 1987, and Ellis Burks and Dante Bichette for the Colorado Rockies in 1996.

Members