Acin
Acin is a surname. Notable people with the surname include:

Andrej Aćin (born 1972), Serbian director
Ramón Acín (1888-1936), Spanish anarcho-syndicalist
Acin may also refer to Acín, an inhabited village in Jaca, in the province of Huesca, in Spain. See also
Asociación de Cabildos Indígenas del Norte del Cauca, Colombian indigenous rights organization
ac.in, second-level domain used for universities in India