In college athletics in the United States, schools typically join together in conferences for regular play.

National Collegiate Athletic Association (NCAA)

National Association of Intercollegiate Athletics (NAIA)

Other collegiate sports associations

In general
Association of Christian College Athletics (ACCA)
Central Plains Athletic Conference (CPAC)
Eastern College Athletic Conference (ECAC)
Liga Atletica Interuniversitaria de Puerto Rico (LAI)
Midwest Christian College Conference
National Christian College Athletic Association (NCCAA)
Northern Intercollegiate Athletic Conference
Pacific Christian Athletic Conference
United States Collegiate Athletic Association (USCAA)
Penn State University Athletic Conference
Yankee Small College Conference
Wisconsin Collegiate Conference

Boxing
National Collegiate Boxing Association (NCBA)

Cycling
Eastern Collegiate Cycling Conference (ECCC)

Gymnastics
East Atlantic Gymnastics League (EAGL) (women)
Eastern Intercollegiate Gymnastics League (EIGL) (men)

Lacrosse
See: :Category:College lacrosse leagues in the United States

Rowing
Eastern Association of Rowing Colleges (EARC) (men)
Eastern Association of Women's Rowing Colleges (EAWRC)

Sprint football
Collegiate Sprint Football League (CSFL)

Volleyball
Eastern Intercollegiate Volleyball Association (EIVA) (men)
North East Collegiate Volleyball Association (men)

Water polo
Western Water Polo Association

Wrestling
Eastern Intercollegiate Wrestling Association (EIWA)
National Collegiate Wrestling Association
Mid-Atlantic – Teams from Tennessee, the Carolinas, Virginia, Maryland, and Delaware
North Central – Teams from Ohio, Michigan, Indiana, Illinois, and Wisconsin
Northeast – Teams from New York, Pennsylvania, New Hampshire, Connecticut, Massachusetts, Rhode Island, and Vermont
Northwest – Teams from Washington and British Columbia
Southeast – Teams from Florida, Alabama, Georgia and Mississippi
Southwest – Teams from Texas, Colorado, New Mexico, Louisiana, and Kansas
West – Teams from California, Nevada, Utah and Arizona

Junior colleges

National Junior College Athletic Association (NJCAA)
Alabama Community College Conference
Arizona Community College Athletic Conference
Arrowhead Conference
Bi-State Conference
Carolinas Junior College Conference
Eastern Pennsylvania Collegiate Conference
Garden State Athletic Conference
Georgia Junior College Athletic Association
Great Rivers Athletic Conference
Illinois N4C Conference
Illinois Skyway Collegiate Conference
Iowa Community College Athletic Conference
Kansas Jayhawk Community College Conference
Maryland Junior College Athletic Conference
Michigan Community College Athletic Association
Mid-Florida Conference
Mid Hudson Athletic Conference
Mid-State Athletic Conference
Mid-West Athletic Conference
Midwest Football Conference (NJCAA)
Minnesota College Athletic Conference 
Mississippi Association of Community & Junior Colleges
MISS-LOU Junior College Conference
Missouri Community College Athletic Conference
Mon-Dak Conference
Mountain Valley Conference
NJCAA Region 9
Ohio Community College Athletic Conference
Nebraska Community College Athletic Conference
Northeast JC Football Conference
Panhandle Conference
Pennsylvania Collegiate Athletic Association
Southern Florida Conference
Scenic West Athletic Conference
Southwest Junior College Football Conference
Tennessee Junior & Community College Athletic Association
Western Junior College Athletic Conference
Western New York Athletic Conference
Western Pennsylvania Collegiate Conference
Western States Football League
Wisconsin Technical College Conference
Wyoming Community College Athletic Conference

Northwest Athletic Association of Community Colleges

Charter members
Centralia College - Centralia, Washington
Clark College - Vancouver, Washington 
Everett Community College - Everett, Washington 
Grays Harbor College - Aberdeen, Washington 
Lower Columbia College - Longview, Washington
Mt. Vernon Junior College (now Skagit Valley College) - Mt. Vernon, Washington
Olympic College - Bremerton, Washington 
Skagit Valley College (formerly Mt. Vernon Junior College)
Wenatchee Valley College - Wenatchee, Washington
Yakima Valley Community College - Yakima, Washington

Region members 

Northern Region
Bellevue College - Bellevue, Washington
Douglas College - New Westminster, British Columbia
Edmonds Community College - Lynnwood, Washington
Everett Community College - Everett, Washington 
North Seattle Community College - Seattle, Washington
Olympic College - Bremerton, Washington
Peninsula College - Port Angeles, Washington
Shoreline Community College - Shoreline, Washington
Skagit Valley College - Mount Vernon, Washington
Whatcom Community College - Bellingham, Washington

Southern Region
Chemeketa Community College - Salem, Oregon
Clackamas Community College - Oregon City, Oregon
Lane Community College - Eugene, Oregon
Linn-Benton Community College - Albany, Oregon
Mt. Hood Community College - Gresham, Oregon
Portland Community College - Portland, Oregon
Southwestern Oregon Community College - Coos Bay, Oregon
Umpqua Community College - Roseburg, Oregon

Eastern Region
Big Bend Community College - Moses Lake, Washington
Blue Mountain Community College - Pendleton, Oregon
Columbia Basin College - Pasco, Washington 
Community Colleges of Spokane - Spokane, Washington 
Treasure Valley Community College - Ontario, Oregon
Walla Walla Community College - Walla Walla, Washington
Wenatchee Valley College - Wenatchee, Washington
Yakima Valley Community College - Yakima, Washington

Western Region
Centralia College - Centralia, Washington
Clark College - Vancouver, Washington
Grays Harbor College - Aberdeen, Washington
Green River Community College - Auburn, Washington
Highline Community College - Des Moines, Washington
Lower Columbia College - Longview, Washington
Pierce College - Lakewood, Washington
South Puget Sound Community College - Olympia, Washington
Tacoma Community College - Tacoma, Washington

California Community College Athletic Association
Bay Valley Conference
Big Eight Conference (California)
Central Valley Conference
Coast Conference
Foothill Athletic Conference
Golden Valley Conference
Orange Empire Conference
Pacific Coast Conference (California)
South Coast Conference
Western State Conference

Sports lists