Marion, who had 52 tackles during that six-game stretch, also picked off Peyton Manning twice during their Monday night rout of the Colts on Dec. 10.
This is the sixth time in franchise history a Dolphins player has been named Defensive Player of the Month, the first since linebacker Robert Jones was honored for his performance in December of 1998.
Defensive end Jason Taylor was asked on Wednesday about the play of Marion, who was re-signed in the offseason after he failed to get an attractive offer as an unrestricted free agent.
"We talked in the offseason how big he was," Taylor said. "He was deserving of the Pro Bowl. He know how valuable he is, and we need him here."