Hank Patterson (born Elmer Calvin Patterson; October 9, 1888 – August 23, 1975) was an American actor and musician. He is known foremost for playing two recurring characters on three television series: the stableman Hank Miller on Gunsmoke and farmer Fred Ziffel on both Petticoat Junction and Green Acres.

Patterson found plenty of movie work, mainly playing cantankerous types as well as blacksmiths, hotel clerks, farmers, shopkeepers and other townsmen, usually bit roles and character parts in Republic Pictures westerns, and then in popular juvenile TV westerns such as The Cisco Kid, The Adventures of Kit Carson, The Lone Ranger, and Annie Oakley.