Acca
Acca or ACCA may refer to:

Mythology
Acca, one of the comrades of Camilla in Greek mythology
Acca Larentia, goddess in Roman mythology

Organizations
Aerospace Industries Association, previously the Aeronautical Chamber of Commerce
American Clinical and Climatological Association, founded in 1884
American College Counseling Association
American Corporate Counsel Association, now Association of Corporate Counsel (ACC), a group for attorneys of private-sector organizations
Anglican Catholic Church in Australia
Antiochian Catholic Church in America, one of the Independent Catholic Churches
Association of Chartered Certified Accountants, a UK-based accountancy body which offers the Chartered Certified Accountant qualification
Association of Christian College Athletics, an organization of collegiate athletics
Attenborough Centre for the Creative Arts, an arts centre in Brighton and Hove, UK
Australian Centre for Contemporary Art, an art gallery in Melbourne
United States Army Court of Criminal Appeals, an appellate court that reviews certain court-martial convictions of U.S. Army personnel

People
Three Anglo-Saxon bishops:
Acca of Dunwich, 7th century Bishop of Dunwich
Acca of Hereford (died c. 764), Bishop of Hereford
Acca of Hexham (c. 660 – 740/742), saint and Bishop of Hexham

Science and technology
Acca (plant), a genus of plants native to South America
Acetyl-CoA carboxylase, in biology
Adaptive chosen-ciphertext attack, in cryptography
Advanced Composite Cargo Aircraft, a project of the US Air Force Research Laboratory

Other uses
ACCA: 13-ku Kansatsu-ka, a Japanese manga series written and illustrated by Natsume Ono
Acre, Israel (transliterated as "Acca" from an Arabic spelling)
Acca, a silk fabric decorated with gold, named for the city
Accumulator bet, in gambling
Armed Career Criminal Act, in law
Acapulco (nightclub), a nightclub in Halifax, England known as the Acca