Francis Magalona
Nevada Interscholastic Activities Association
Pennsylvania Interscholastic Marching Band Association
Interscholastic Equestrian Association
Hudson County Interscholastic League
Oahu Interscholastic Association
Prairie View Interscholastic League
New Jersey State Interscholastic Athletic Association
Muslim Interscholastic Tournament
Pennsylvania Interscholastic Athletic Association
University Interscholastic League
District of Columbia Interscholastic Athletic Association
Connecticut Association of Schools
California Interscholastic Federation
New York Interscholastic Athletic Association
Maui Interscholastic League
Rhode Island Interscholastic League
Delaware Interscholastic Athletic Association
Interscholastic League of Honolulu
Pioneer Valley Interscholastic Athletic Conference
Metropolitan Interscholastic Conference
Western Pennsylvania Interscholastic Athletic League
Portland Interscholastic League
Philadelphia Public League
North Jersey Interscholastic Conference
Union County Conference
Kauai Interscholastic Federation
Massachusetts Interscholastic Athletic Association
Interscholastic Association of Southeast Asian Schools
New Jersey Interscholastic Athletic Association
New England Interscholastic Rowing Association
Interscholastic Sailing Association
Sussex County Interscholastic League
Virginia Interscholastic Association
Washington Interscholastic Activities Association
Northern New Jersey Interscholastic League
Interscholastic Hockey League
North Bergen Interscholastic Athletic League
Southern Interscholastic Press Association
Georgia Interscholastic Association
Maryland Interscholastic Athletic Association
Arizona Interscholastic Association
Fairfield County Interscholastic Athletic Conference
National Interscholastic Cycling Association
Louisiana Interscholastic Athletic and Literary Organization
Florida Interscholastic Athletic Association
Long Island Interscholastic Athletic League
Interscholastic Athletic Association of Maryland
High school ice hockey in Pennsylvania
Big Island Interscholastic Federation
List of University Interscholastic League events
Alabama High School Athletic Association
New Hampshire Interscholastic Athletic Association
Kansas City Interscholastic Conference
New Brunswick Interscholastic Athletic Association
CIF North Coast Section
Wisconsin Interscholastic Athletic Association
MIAA Division 1A boys' ice hockey tournament
High school football
CIF California State Meet
Ohio Southwest Region defunct athletic conferences
Amateur sports