Oyarzún or Oyarzun is a surname. Notable people with the surname include:
Alain Oyarzun (born 1993), Spanish professional footballer Aureliano Oyarzún (1858–1947), Chilean physician and anthropologist Carlos Oyarzun (born 1981), Chilean professional road cyclist Diego Oyarzún (born 1993), Chilean professional footballer Elías Oyarzún (born 1988), Chilean handball player Enrique Oyarzún Mondaca (1860–1849), Chilean politician, lawyer, President of the Senate of Chile Juan Carlos Oyarzún (1951–2021), Argentine politician Leonor Oyarzún (1919–2022), Chilean family therapist, First Lady of Chile (1990–1994) Luis Oyarzún (footballer) (born 1982), Chilean former footballer Luis Oyarzún Peña, Chilean writer and aesthetician María Eugenia Oyarzún (born 1936), Chilean journalist, writer, and former diplomat María José Oyarzún (born 1980), Chilean teacher, member of the Chilean Constitutional Convention Mila Oyarzún (1912–1982), Chilean writer, poet and human rights activist Nelson Oyarzún (1943–1978), Chilean football manager Román Oyarzun Oyarzun (1882–1968), Spanish political activist, publisher, diplomat, entrepreneur, historian Víctor Oyarzún (born 1980), Chilean footballer
See also Estadio Municipal Nelson Oyarzún Arenas, stadium located in Chillán, Chile Spanish name for Oiartzun, a town and municipality in the Basque Country