Elfrida von Nardroff (July 3, 1925 – November 11, 2021) was an American game show contestant. In 1958, she won $220,500 (equivalent to $2,070,971 in 2021) on the game show Twenty-One, more money than any other contestant on the show. Later it was revealed that there was cheating on the game show and von Nardroff committed perjury in Grand Jury proceedings.