OMAC

OMAC can refer to:
 * OMAC (Buddy Blank), a DC Comics superhero
 * OMAC (comics): a fictional organization of powerful cyborgs in comic books published by DC Comics
 * The OMAC Project, a comics miniseries featuring with the OMACs
 * Michael Costner, the last remaining OMAC cyborg, chronicled in the 2006 OMAC miniseries


 * Old Man's Aircraft Company, a business aircraft company which made several prototypes of the Laser 300 plane in the late 1980s and early 1990s
 * One-key MAC, a construction in cryptography
 * Order of Malta Ambulance Corps, an Irish first-aid organisation linked to the Sovereign Military Order of Malta
 * OMAC (Industry Organization): Organization for Machine Automation and Control
 * Otherways, Otherways Management Association Club (OMAC), a vanity award organisation