Mars is a surname. Notable people with the surname include:
Adam Mars (born 1981), American artistAlastair Mars (1915–1985), British World War II submarine commander and authorAlexandre Mars (born 1976), French businessman and philanthropistBetty Mars (1944–1989), French singer and actressBruno Mars (born 1985), American singer-songwriterChris Mars, musician and painterDwayne Mars (born 1989), Barbadian footballerEd Mars (1866–1941), American baseball playerEthel V. Mars (1884–1945), American businesswoman and racehorse ownerFlorence Mars (1923–2006), American civil rights activist and authorForrest Mars (disambiguation)Forrest Mars, Jr. (born 1931), American confectionery magnateForrest Mars, Sr. (1904–1999), confectionery magnateFranklin Clarence Mars (1883–1934), confectionery magnateGerald Mars (born 1933), British social anthropologistHans-Joachim Mars (born 1926), German former sports shooterJacqueline Mars (born 1939), American confectionery magnateJames C. Mars (1876–1944), American aviation pioneerJohn Mars, Canadian singer, songwriter, and percussionistJohn Franklyn Mars (born 1935), American confectionery magnateJohnny Mars (born 1942), American harmonica player, singer, and songwriterKenneth Mars, (1936–2011), American actorKettly Mars (born 1958), Haitian poet and novelistMelissa Mars (born 1979), French singer and actressMick Mars, lead guitarist for Mötley CrüeRoman Mars, podcaster