- American Federation of Umpires (AFU)
 - Group of baseball/softball umpires who share the common goal of consistent improvement in their officiating skills and knowledge of the game. - California Baseball Umpires Association
- Providing training for college, high school, adult, and youth league umpires in Southern California.
- eUmpire.com
- Includes current news and rule changes, ruling scenarios, interviews, and more.
- Fox Valley Blues Umpires Association
- Specialising in NCAA, IHSA, and summer league tournaments.
- Independent Umpires Association
- Serving southern New Jersey colleges, secondary schools and independent leagues.
- Newcastle Baseball Umpires Association Inc.
- Encompassing the cities of Newcastle, Maitland, Cessnock and Lake Macquarie, and the Shires of Singleton and Port Stephen. Affiliated with New South Wales Country Baseball Umpire's Association.
- San Diego County Baseball Umpires Association
- Providing training and assignments of officials throughout the county.
- Steve O's Umpire Resource Page
- Offers links, trivia, pictures, statistics, and more. Includes a brief history of umpires.
- Suburban Umpires Association, Inc.
- Baseball, softball and tournament umpires for the Chicagoland area.
- Umpire Resource Center
- Providing baseball officials with one site for all their reference needs.
- Western Maine Board of Baseball Umpires
- Offers schedule, by-laws, dress code, and more.
- Western New York Umpires Association
- Officiates high school and summer baseball and softball leagues.
- World Umpires Association
- Official site of Major League Baseball's umpires.
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