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