DIAC (disambiguation)

DIAC is a four-letter acronym that may stand for:
 * DIode for Alternating Current, a bidirectional trigger diode
 * Department of Immigration and Citizenship, an Australian government department
 * Dental Industry Association of Canada
 * Disability Information & Advice Centre, a British charity
 * Design Industry Advisory Committee
 * Defense Intelligence Analysis Center, the former name of the Defense Intelligence Agency Headquarters
 * Dubai International Academic City