Note: Sports play for Fall, 2020 will be on a regional basis. Regions may include schools from multiple leagues. The complete regional setup can be viewed at https://www.casciac.org/fallregions/.
While the CIAC sponsors state tournaments and governs athletic eligibility and competition across the state, there are also 11 leagues that provide another venue for play and regulate competition. The leagues work to enhance regular-season competition and create another postseason experience for students while fostering regional rivalries. The league experience is a highly-valuable piece in the larger CIAC puzzle and plays a key role in serving the student-athlete experience.
Berkshire League
League Members:
- Gilbert
- Housatonic Regional
- Litchfield
- Nonnewaug
- Northwestern
- Shepaug Valley
- Terryville
- Thomaston
- Wamogo
Capitol Region Athletic League
- League Website: crec.ss12.sharpschool.com/about/crec_athletics/c_r_a_l_webpage/
League Members:
- Academy of Aerospace and Engineering
- Academy of Science and Innovation
- Achievement First
- Civic Leadership
- Metropolitan Learning Center
- Parish Hill
- University
Central Connecticut Conference (CCC)
- League Website: www.centralconnecticutconference.org
League Members:
- Avon
- Berlin
- Bloomfield
- Bristol Central
- Bristol Eastern
- Bulkeley
- Conard
- E.O. Smith
- East Catholic
- East Hartford
- Enfield
- Farmington
- Glastonbury
- Hall
- Hartford Public
- Lewis Mills
- Maloney
- Manchester
- Middletown
- New Britain
- Newington
- Northwest Catholic
- Plainville
- Platt
- RHAM
- Rocky Hill
- Simsbury
- South Windsor
- Southington
- Tolland
- Wethersfield
- Windsor
Eastern Connecticut Conference (ECC)
- League Website: www.eccathletics.org
League Members:
- Bacon Academy
- East Lyme
- Fitch
- Griswold
- Killingly
- Ledyard
- Lyman Memorial
- Montville
- New London
- Norwich Free Academy
- Plainfield
- Putnam
- St. Bernard
- Stonington
- Tourtellotte
- Waterford
- Wheeler
- Windham
- Woodstock Academy
Fairfield County Interscholastic Athletic Conference (FCIAC)
- League Website: www.fciac.net
League Members:
- Bridgeport Central
- Brien McMahon
- Danbury
- Darien
- Fairfield Ludlowe
- Fairfield Warde
- Greenwich
- New Canaan
- Norwalk
- Ridgefield
- St. Joseph
- Stamford
- Staples
- Trinity Catholic
- Trumbull
- Westhill
- Wilton
Naugatuck Valley League (NVL)
League Members:
- Ansonia
- Crosby
- Derby
- Holy Cross
- Kennedy
- Naugatuck
- Oxford
- Sacred Heart
- Seymour
- St. Paul Catholic
- Torrington
- Watertown
- Waterbury Career
- Wilby
- Wolcott
- Woodland
Southern Connecticut Conference (SCC)
- League Website: www.southernconnecticutconference.org
- Amity
- Branford
- Career Magnet
- Cheshire
- Daniel Hand
- East Haven
- Fairfield Prep
- Foran
- Guilford
- Hamden
- Hillhouse
- Jonathan Law
- Lauralton Hall
- Lyman Hall
- Mercy
- North Haven
- Notre Dame-West Haven
- Sacred Heart Academy
- Sheehan
- Shelton
- West Haven
- Wilbur Cross
- Xavier
South West Conference (SWC)
- League Website: www.swc-ct.com
- Bethel
- Brookfield
- Bunnell
- Immaculate
- Joel Barlow
- Kolbe Cathedral
- Masuk
- New Fairfield
- New Milford
- Newtown
- Notre Dame-Fairfield
- Pomperaug
- Stratford
- Weston