
The American Baseball Coaches Association (ABCA) is the world's largest amateur baseball coaching organization. It was founded in 1945 as the American Association of College Baseball Coaches. Now, the ABCA is composed of nearly 13,000 baseball coaches from all levels of amateur baseball, including youth, high school, travel ball, NJCAA Divisions I, II, and III, NAIA, and NCAA Divisions I, II and III, among others.

The Baseball Writers' Association of America (BBWAA) is a professional association for baseball journalists writing for daily newspapers, magazines and qualifying websites.

The Golden Era Committee was one of three 16-member committees appointed by the board of directors of the National Baseball Hall of Fame and Museum in 2010 to replace the National Baseball Hall of Fame Committee on Baseball Veterans, which had been formed in 1953. All of these committees were established to consider and elect eligible candidates to the Hall of Fame who were not elected via the Baseball Writers' Association of America (BBWAA) ballot.

The Japan Professional Baseball Players Association is the players' union that represents Japanese baseball players and their interests in Nippon Professional Baseball. The organization was incorporated in 1980 and was approved as a labor union in 1985. The current union chairman is Ginjiro Sumitani and the current institute chairman is Yohei Oshima.

The Major League Baseball Players Association is the collective bargaining representative for all current Major League Baseball players. All players, managers, coaches, and athletic trainers who hold or have held a signed contract with a Major League club are eligible for membership in the Association.

PONY Baseball and Softball is a non-profit organization with headquarters in Washington, Pennsylvania. Started in 1951, PONY organizes youth baseball and softball leagues and tournaments, as over 500,000 players annually play PONY in over 4,000 leagues throughout the United States and over 40 countries world-wide. The televised Pony League World Series held annually in August at Washington's Lew Hays Pony Field attracts teenage teams from around the world. Membership is open to children and young adults from age 4 to 23 and the leagues are organized in two-year age brackets with "and-under" programs. Hundreds of PONY players have gone on to Major League Baseball careers, including Hall of Fame inductees Tony Gwynn and Cal Ripken Jr.

Reviving Baseball in Inner Cities (RBI) is a youth baseball program operated by Major League Baseball. This youth initiative is designed to provide young people from underserved and diverse communities the opportunity to play baseball and softball. The program was created by John Young in 1989 in Los Angeles, and now serves more than 200 communities.