Duldig is a surname. Notable people with the surname include:
Eva Duldig (born 1938), Austrian-born Australian and Dutch tennis player, author; daughter of Karl and Slawa Karl Duldig (1902–1986), Austrian-Australian sculptor; spouse of Slawa Lance Duldig (1922–1998), Australian cricketer Slawa Duldig (1902–1975), Polish-born Austrian-Australian inventor, artist, interior designer, and teacher; spouse of Karl