Zelnik is a surname of Slovak and Slovene origin, originating as a topographic name meaning "cabbage". Notable people with the surname include:
Frederic Zelnik (1885-1950), Austrian producer, director, and actor Jerzy Zelnik (born 1945), Polish actor
See also Zelnik, a pastry eaten in Bulgaria and North Macedonia Zelnik István Southeast Asian Gold Museum, a private museum in Budapest, Hungary Zelnick