INAC may refer to:
Indian and Northern Affairs Canada, a department of the government of Canada,
Instituto Nacional de Aviación Civil, the Argentine aviation institution,
National Institute of Civil Aviation (Instituto Nacional de Aeronáutica Civil), the former Venezuelan civil aviation agency,
Nicaraguan Civil Aeronautics Institute (Instituto Nicaragüense de Aeronáutica Civil), the Nicaraguan civil aviation agency,
Instituto Nacional de Cultura, a Panamanian governmental agency,
National Meat Institute (Instituto Nacional de Carnes), a Uruguayan governmental agency,
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