Vonnegut ( ) is a German-rooted surname. Vonnegut is derived from two German words, vonn(e), meaning 'by', and gut, meaning 'good'.

Notable people with the surname Vonnegut include:

Kurt Vonnegut (1922–2007), American science fiction writer Clemens Vonnegut (1824–1906), German-American businessman, great-grandfather of Kurt Vonnegut Bernard Vonnegut I (1855–1908), American lecturer and architect, son of Clemens Vonnegut, Sr. and grandfather of Kurt Kurt Vonnegut, Sr. (1884–1957), American architect and lecturer, son of Bernard I and father of Kurt Bernard Vonnegut (1914–1997), American atmospheric scientist, elder brother of Kurt Edith Vonnegut (born 1949), American painter, daughter of Kurt Mark Vonnegut (born 1947), American memoirist and journalist, son of Kurt Norb Vonnegut (born 1958), American thriller author, fourth cousin of Kurt

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