The Revolutionary Marxist Group (RMG) was a Trotskyist political organization in Canada in the 1970s.
Though not a registered political party it did field small numbers of candidates in several elections.
Its main rival, the League for Socialist Action, supported the American-led faction in the international conflict within the USFI.
In 1977, the RMG, LSA and GMR fused to form the Revolutionary Workers League/Ligue Ouvrière Révolutionnaire.
Prominent members of the RMG included Steve Penner, Judy Rebick, Joe Flexer, Gary Kinsman, Bret Smiley and Barry Weisleder.