Athletic conference
collection of sports teams, playing competitively against each other, sometimes subdivided into divisions
Olympic League
Omega League
Orange Coast League
Orange League
Pac-7 League
Pacific League
Peninsula Athletic League
Pioneer League
Prairie Conference
Prep League
Private School Athletic League
Rio Hondo League
San Andreas League
Santa Clara Valley Athletic League
Santa Cruz Coast Athletic League
Santa Cruz League
Santa Fe League
South Coast League
South Sequoia League
South Yosemite League
Southeast Yosemite League
Southwest Yosemite League
Southwestern League
Suburban League
Sunbelt League
Sunkist League
Sunset League
Sunshine League
Tri-County Athletic Association
Tri-River League
Trinity League
Valley Football Association
West Sequoia League
West Sierra League
West Yosemite League
Western Athletic Conference
Laughery Valley Conference
Valle Vista League
Varsity Sports
Mountain Athletic Conference
Bay State Conference
Tri-Valley Conference (Michigan)
New England Collegiate Conference
Cape Ann League
Commonwealth Athletic Conference
Dual County League
Northwest Athletic Conference
Detroit Public School League
Kansai Collegiate American Football League
Hokkaido American Football Association