Major League Baseball: Official Rules
- Complete rules of major league baseball, with diagrams and glossary.
- http://www.mlb.com/NASApp/mlb/mlb/official_info/official_rules/foreword.jsp

Jim's Baseball Rules - Little League
- Provides a myriad of baseball rules and regulations, FAQs, umpiring tips, myths and links. Gathered by a certified Little League umpire and former Chief Umpire for California District 3.
- http://eteamz.active.com/baseball/rules/obr/index.cfm?

Baseball Umpires Rules and Interpertation
- Major League Baseball rules, interpertations, questions and answers, newsletter, do's and don't on the playing field
- http://baseballumpires.com

Pony Baseball and Softball
- Official site includes affiliated members links, news, calendar, tournaments, and World Series coverage.
- http://www.pony.org/

Interactive Baseball Rules
- Seeks to create a fun environment for baseball umpires, players, coaches and fans to enhance their understanding of the rules of the game. Offers online quiz, along with rules/officiating resources.
- http://www.macroweb.com/ibrules/index.html

Amateur Baseball Umpire
- Contains information on baseball umpiring and officiating.
- http://www.amateurumpire.com/

Official Communications
- Offers baseball rules and officiating videotapes. Features online shopping and video previews.
- http://www.officialcom.com/