ORAC or Orac may refer to:
Oxygen radical absorbance capacity, a scalar value derived in the laboratory for comparing the antioxidant content of different foods or nutritional supplements Office of the Registrar of Aboriginal Corporations, former name of the Australian government agency now called Office of the Registrar of Indigenous Corporations (ORIC) Orac (Blake's 7, a computer in the science fiction television series Blake's 7 Orac (MD program), a classical molecular dynamics program for solvated biomolecules Orac, Leova, a commune in Moldova Orac, an early poker-playing computer program developed by Mike Caro ORAC, Wilhelm Reich's abbreviation for his orgone accumulator
People Orac, pseudonym of David Gorski, cancer surgeon and blogger critical of alternative medicine Costel Orac (born 1959), Romanian footballer Daniel Orac (born 1985), Romanian footballer
See also Orak (disambiguation)