ACA may refer to:
Academi is an American private military company that was founded in 1997 by former Navy SEAL officer Erik Prince as Blackwater.
An academic degree is a qualification awarded on successful completion of a course of study in higher education, normally at a college or university.
As the oldest college in the United States, Harvard University has a long tradition of academic dress.
An academic term (or simply "term") is a portion of an academic year, the time during which an educational institution holds classes.
The Academy of Motion Picture Arts and Sciences (AMPAS) is a professional honorary organization with the stated goal of advancing the arts and sciences of motion pictures.
Acacia mearnsii is a fast-growing, extremely invasive leguminous tree native to Australia. Common names for it include black wattle, Acácia-negra (Portuguese), Australian acacia, Australische Akazie (German), Swartwattel (Afrikaans), Uwatela (Zulu).
Academic dress is a traditional form of clothing for academic settings, mainly tertiary (and sometimes secondary) education, worn mainly by those who have been admitted to a university degree (or similar), or hold a status that entitles them to assume them (e.g., undergraduate students at certain old universities).
Since its founding in 1956 as a rabbinical school, The Academy for Jewish Religion (AJR or The Academy) has been at the forefront of pluralistic rabbinic and cantorial training.
Acadia (French: Acadie) was a colony of New France in northeastern North America that included parts of eastern Quebec, the Maritime provinces, and modern-day Maine to the Kennebec River.