Several ships of the French Navy have borne the name Mars, after Mars, the Roman god of war:
- French ship Mars (1705), broken up in 1721. Claude de Forbin's 60-gun flagship at the Battle of Beachy Head (1707).
- French ship Mars (1740), captured by HMS Nottingham off Cape Clear in 1746 and taken into service as HMS Mars. She was wrecked in 1755 near Halifax, Nova Scotia.
- Mars (1762), wrecked in 1765.
- French ship Mars (1770), burnt in 1773.
- Mars (1860), laid down in 1835 as Sceptre, renamed Masséna in 1840, redesigned as a screw steamer in 1856, launched and completed in 1860. Stricken in 1881 and used as an accommodation hulk at Toulon, renamed Mars in 1892. Broken up for scrap in 1906.
