GCAC may stand for:
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Gulf Coast Athletic Conference, an intercollegiate athletic conference in the Division I ranks of the NAIA
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Gateway Collegiate Athletic Conference, a former women's athletic conference with one men's sport (football) in the Division I ranks of the NCAA
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Girls Catholic Athletic Conference
A girl is a young female human, usually a child or an adolescent. When a girl becomes an adult, she is accurately described as a ''woman''. However, the term ''girl'' is also used for other meanings, including ''young woman'',Dictionary ...
, an American high school athletic conference, counterpart of the
Chicago Catholic League
The Chicago Catholic League (CCL) is a high school athletic conference based in Chicago, Illinois, United States. All of the schools are part of the Illinois High School Association, the governing body for Illinois scholastic sports. While some o ...
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