Delf may refer to:Delf (waterway), in Delfzijl, Netherlands Barrie Delf, English professional footballer Marion Delf-Smith (1883–1980), British botanist whose author abbreviation is "Delf" Percy Delf Smith (1882–1948), British artist, husband of Marion Delf-Smith DELF - Diplôme d'études en langue française - a certification of French language abilities