Delteil is a surname. Notable people with the surname include:
Desha Delteil (1899–1980), American dancer and artist's model Joseph Delteil (1894–1978), French writer and poet Joseph Delteil (speleologist) (1909–1979), French speleologist Loÿs Delteil (1869–1927), French engraver and lithographer Maite Delteil (born 1933), French painter