- All American Amateur Baseball Association (AAABA)
 - Players compete to catch the eye of baseball scouts looking to promote them to the professional leagues. - American Amateur Baseball Congress (AABC)
- Baseball Canada
- Governing body for amateur baseball in Canada, as recognised by the provincial baseball associations, Sport Canada, and the International Baseball Association.
- Canton Area Baseball League
- League for men, age 30 and over.
- Cape Cod Baseball League
- Summer league featuring the best college players.
- Continental Amateur Baseball Association (2)
- Cranberry Baseball League
- Consists of 11 teams in Southeastern Massachusetts.
- FlutterBall League
- League stats, history, teams, and players for this unique brand of baseball.
- Greater Philadelphia Men's Adult Baseball League
- Includes sign-up information.
- Intercounty Major Baseball League@
- Jayhawk League@
- Los Angeles County Adult Baseball Association
- Men's Senior/Adult Baseball Leagues (MSBL/MABL) (8)
- National Adult Baseball Association (1)
- National Baseball Congress (1)
- New England Collegiate Baseball League@
- Northwoods League (20)
- Orlando Baseball
- 28 years old and over league, offers schedule, standings, pictures, and news.
- San Jose Men's Adult Baseball League@
- United States Amateur Baseball Association
- Provides for the promotion and development of players and fans in youth baseball past season tournament competitions.
- Women's National Adult Baseball Association@
- Yawkey Baseball League of Boston
- Adult league with fourteen teams and two divisions. Offers team histories, standings, upcoming events, and regulations.
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