List of organized baseball leagues

Youth Leagues & Major Organizations

• American Legion Baseball, a youth program, headquartered in Indianapolis, Indiana.
• Babe Ruth League, a youth program, headquartered in Hamilton, New Jersey.
• Fellowship of Christian Athletes
• Little League Baseball, a youth program, headquartered in Williamsport, Pennsylvania.
• Pony Baseball, a youth program, headquartered in Washington, Pennsylvania

High school

• In the US, the National Federation of State High School Associations (NFHS) and each state association governs the play of baseball at the high school level. The Federated Christian Athletic Association (FCAA) and state Christian associations oversee the play of baseball at the private Christian School level. Note, however, that a substantial number of Christian schools choose instead to join their state's general athletic association if the organization's rules allow it.

Baseball for People with Disabilities

• Alternative Baseball, United States

Amateur baseball

• Abalone League, United States
• Ligue de Baseball Élite du Québec, Canada
• New Brunswick Senior Baseball League, Canada
• Nova Scotia Senior Baseball League, Canada
• National Adult Baseball Association, United States
• All-American Amateur Baseball Association, United States
• National Amateur Baseball Federation, United States
• American Amateur Baseball Congress, United States

College baseball

• NCAA conferences: Division I, Division II, Division III, and the College World Series (Div. I, Div. II, Div. III)
• NAIA conferences, including the NAIA Baseball World Series
• National Club Baseball Association (NCBA) conferences
• National Junior College Athletic Association (NJCAA) conferences
• Collegiate summer baseball leagues

Town Team Baseball

Townball is a popular tradition in the Upper Midwest, with grassroots support at the local level.

Professional baseball

• Major League Baseball (MLB) in the United States and Canada, made up of two component leagues;
  • National League
  • American League
• Minor League Baseball (MiLB) in the United States and Canada, comprising several levels and multiple component leagues;
  See also: List of Minor League Baseball leagues and teams
  • Triple-A
    • International League
    • Pacific Coast League
  • Double-A
    • Eastern League
    • Southern League
    • Texas League
  • High-A
    • Midwest League
    • Northwest League
    • South Atlantic League
  • Single-A
    • California League
    • Carolina League
    • Florida State League
  • Rookie
    • Arizona Complex League
    • Florida Complex League
  • Fall baseball
    • Arizona Fall League
• Independent baseball leagues in the United States and Canada
  • MLB Draft League
  • MLB Partner leagues
    • American Association of Professional Baseball
    • Atlantic League of Professional Baseball
    • Frontier League
    • Pioneer League
  • Canadian Baseball League
  • Empire Professional Baseball League
  • Pecos League
  • United Shore Professional Baseball League

Instructional Leagues

• California Winter League*

Exhibition Leagues

• Banana Ball Championship League