OAC

OAC or OAc may refer to:

Organizations

 * Objectivist Academic Center, an educational institution founded by the Ayn Rand Institute
 * Ohio Arts Council
 * Ohio Athletic Conference, an NCAA Division III athletic conference
 * On Athletics Club, a professional group of long distance runners
 * One America Committee
 * Online Archive of California
 * Ontario Agricultural College
 * Ontario Arts Council
 * Orthodox Anglican Church, a denomination of the Continuing Anglican movement in America, part of the Orthodox Anglican Communion
 * Orthodox Anglican Communion, a worldwide Continuing Anglican body of which the Orthodox Anglican Church is a part

Other

 * Acetoxy group (OAc), a chemical functional group
 * Object Action Complex
 * Oral anti-coagulant
 * Ontario Academic Credit
 * Amtrak station code for Oakland Coliseum Station
 * Olivetolic acid cyclase, an enzyme