George Lazenby ( born September 5 , 1939 ) is an Australian-born model and actor . He is most famous for his role as James Bond in the movie On Her Majesty 's Secret Service ( 1968 ) . George Robert Lazenby ( ; born 5 September 1939 ) is an Australian actor and former model , best known for portraying James Bond in the 1969 film On Her Majesty 's Secret Service .