Vonnegut is the surname of:
- Kurt Vonnegut (1922-2007), American science fiction writer
- Clemens Vonnegut, Sr. (1824-1906), German-American businessman
- Bernard Vonnegut, Sr. (1855-1908), American lecturer and architect, son of Clemens Vonnegut, Sr. and grandfather of Kurt Vonnegut
- Kurt Vonnegut, Sr. (1884-1957), American architect and lecturer, son of Bernard Sr. 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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