ISAC

ISAC may refer to:


 * internet Speech Audio Codec (as "iSAC"), a wideband speech codec
 * Institute for the Study of American Cultures, a defunct organization devoted to the study of pre-Columbian contact between the Old and New Worlds
 * Institute for the Study of Ancient Cultures, West Asia & North Africa, a multidisciplinary research center at the University of Chicago
 * Information Sharing and Analysis Center, a cybersecurity non-profit organization
 * Indian Space Research Organisation Satellite Centre, the lead ISRO centre for technology testing and spacecraft assembly integration in India
 * Immune stimulating antibody conjugate, a monoclonal antibody
 * Idol Star Athletics Championships, Korean biannual Athletics gathering

People

 * Isac, variant spelling of Isaac (name)
 * Emil Isac (1886–1954), Romanian poet, dramatist, short story writer and critic
 * Isac Ludo (1894–1973), Romanian writer and political figure
 * Isac Peltz (1899–1980), Romanian prose writer and journalist

Other

 * Vadul lui Isac is a village in Cahul District, Moldova
 * the Isac is a French river in the Loire-Atlantique department