Oller () is a common surname in the Catalan language. Variants are Ollé and Olle. Notable people with the surname include:
Adam Oller (born 1994), American baseball player Denisse Oller (born 1955), Puerto Rican-born broadcaster and journalist Fidela Oller Angelats (1869–1936), Spanish Roman Catholic nun Francisco Oller (1833–1917), Puerto Rican Impressionist painter Francisco Oller Simón (1860–1940), Spanish and Argentinian publisher María Teresa Oller (1920–2018), Spanish Valencian composer and folklorist Narcís Oller (1846–1930), Spanish Catalan author Joseph Oller (1839–1922), Catalan-born French bookmaker, betting innovator and entertainment entrepreneur Rico Oller (1958–2025), U.S. politician
See also Ullr