Walter Slezak (May 3, 1902-April 21, 1983) was an Austrian actor.

Slezak has many American films to his credit including Once Upon a Honeymoon (1942), The Princess and the Pirate (1944), The Miracle (1959), and Treasure Island (1972). He won a Tony Award in 1955 for his role in the Broadway production of "Fanny". At the time of his death, he was survived by three children, including daughter Erika Slezak, who has rose to fame on the soap opera, One Life to Live.