Ryser is a surname. Notable people with the surname include:
- Dany Ryser (born 1957), Swiss football manager
- H. J. Ryser (1923–1985), American mathematician
- Fritz Ryser (1873–1916), Swiss cyclist
See also
- Bruck–Ryser–Chowla theorem, a result in graph theory and combinatorial matrix theory
- Gale–Ryser theorem, a result in graph theory and combinatorial matrix theory
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