Oller is a common surname in the Catalan language. Variants are Ollé and Olle. Notable people with the surname include:
- Adam Oller, American baseball player
- Denisse Oller, Puerto Rican-born broadcaster and journalist
- Fidela Oller (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, U.S. politician
