Little League International publishes the “Rule Book” every year.

The Little League® Rulebook App has been updated for the 2025 season! The Rulebook App contains the Official Regulations, Playing Rules, and Operating Policies for all divisions of Baseball, Softball, and Challenger in one easy-to-use location. The App includes all three rulebooks, exclusive rule interpretation videos, and automatic updates for future seasons after a one-time download of $1.99. Purchase on the Apple App Store or Google Play Store.

Each local Little League also publishes Local Rules that supplement the Green Book and clarify local interpretation.