Posey won the National League award in voting announced Monday by the Baseball Writers' Association of America. Feliz won the American League honor.
Posey drew 20 first-place votes on the 32 ballots. He was called up from Triple-A in late May and hit .305 with 18 home runs and 67 RBIs for the eventual World Series champions.
Feliz set a rookie record with 40 saves in helping Texas reach the World Series for the first time. The rocket-armed righty was listed first on 20 of the 28 ballots.
Voting was done by two BBWAA members in each league city after the regular season.