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
 
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