| Amateur Baseball Umpire Association | | An umpire information center. Umpire associations, umpire equipment, umpire rules; a resource center for umpires to find and share information. |
| American Amateur Baseball Congress | | Coordinates play among US leagues in seven age brackets, from sub-teens through adults. Includes rules, tournament dates, and list of regions and age divisions. |
| American Federation of Umpires(AFU) | | Group of baseball and softball umpires who share the common goal of consistent improvement in their officiating skills and knowledge of the game. Features clinics, a newsletter, and various resources. |
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