GMAC

GMAC or G-MAC may refer to:

Organizations

 * Ally Financial (General Motors Acceptance Corporation), traded as GMAC until 2010
 * GMAC Insurance, former name of National General Insurance
 * GMAC Real Estate, a former real estate franchised brokerage firm
 * GMAC ResCap (Residential Capital), which includes GMAC Mortgage
 * Graduate Management Admission Council, an international association of business schools
 * GMA Canada, the Gospel Music Association of Canada, formerly the CGMA
 * Global Markets Advisory Committee, part of the U.S. Commodity Futures Trading Commission

Computing

 * Galois Message Authentication Code, a type of cryptographic message authentication code
 * Giga multiply–accumulate operations per second, a rate of multiply–accumulate operations
 * Gigabit media access controller, for handling an Ethernet physical transceiver; See Gigabit Ethernet

Other uses

 * Graeme McDowell (born 1979), Northern Irish professional golfer nicknamed G-Mac
 * GMAC Bowl, a sponsored game of college level American football, now known as the LendingTree Bowl
 * Great Midwest Athletic Conference, a U.S. college athletic conference established in 2011 and starting competition in 2012
 * GMAC ebike motor, a modified MAC hub motor sold by Grin Technologies