Mars is a surname. Notable people with the surname include:
Adam Mars (born 1981), American artist
Alastair Mars (1915–1985), British World War II submarine commander and author
Alexandre Mars (born 1976), French businessman and philanthropist
Betty Mars (1944–1989), French singer and actress
Bruno Mars (born 1985), American singer-songwriter
Chris Mars, musician and painter
Dwayne Mars (born 1989), Barbadian footballer
Ed Mars (1866–1941), American baseball player
Ethel V. Mars (1884–1945), American businesswoman and racehorse owner
Florence Mars (1923–2006), American civil rights activist and author
Forrest Mars (disambiguation)
Forrest Mars, Jr. (born 1931), American confectionery magnate
Forrest Mars, Sr. (1904–1999), confectionery magnate
Franklin Clarence Mars (1883–1934), confectionery magnate
Gerald Mars (born 1933), British social anthropologist
Hans-Joachim Mars (born 1926), German former sports shooter
Jacqueline Mars (born 1939), American confectionery magnate
James C. Mars (1876–1944), American aviation pioneer
John Mars, Canadian singer, songwriter, and percussionist
John Franklyn Mars (born 1935), American confectionery magnate
Johnny Mars (born 1942), American harmonica player, singer, and songwriter
Kenneth Mars, (1936–2011), American actor
Kettly Mars (born 1958), Haitian poet and novelist
Melissa Mars (born 1979), French singer and actress
Mick Mars, lead guitarist for Mötley Crüe
Roman Mars, podcaster
