Sontag is a surname. Notable people with the surname include:
Alan Sontag (born 1946), American bridge player and authorAndrzej Sontag (born 1952), Polish triple jumperBrett Sontag (born 1970), American racecar driverDavid Sontag, American catcher and actorEduardo Daniel Sontag (born 1951), American/Argentine mathematicianFrank Sontag (born 1955), American talk radio show hostFrederick Sontag (1924–2009) American author and educatorGeorge Contant Sontag (1864–unknown), American outlawHenriette Sontag (1806–1854), German operatic sopranoJohn Sontag (1861–1893, American outlawLarry Sontag, American catcher and actorSusan Sontag (1933–2004), American essayist, novelist, filmmaker, and activistTiga Sontag (born 1974), Canadian DJ/producerTony Sontag, English darts player