Marius is a male given name, a Roman family name, and a modern surname.
The name Marius was used by members of the Roman gens Maria. It is thought to be derived from either the Roman war god Mars or from the Latin root mas or maris meaning "male". It may also derive from the Latin word mare meaning "sea", the plural of which is maria.
In Christian times, it was syncretized as a masculine form of the unrelated feminine given name Maria, from the Hebrew Miriam, Aramaic variant Mariam, and used alongside it.
Today, the name Marius is a common given name in Romania, Norway, and Lithuania. The name is also used in France, Denmark, Germany, Catalonia, the Netherlands, and South Africa.
The Greek name Marios (Μάριος), the Italian and Spanish name Mario, the Polish name Mariusz, and the Portuguese name Mário are all derived from Marius.
The name Marius may refer to:
- Marius Amundsen (born 1992), Norwegian footballer
- Marius Bianchi (1823-1904), French politician
- Marius Borg Høiby (born 1997), first child of Mette-Marit, Crown Princess of Norway
- Marius Bourrelly (1820-1896), French poet and playwright
- Marius Job Cohen (born 1947), Dutch jurist and politician
- Marius Constant (1925–2004), French composer and conductor
- Marius Ebbers (born 1978), German footballer
- Marius Gabriel (born 1954), South African author
- Marius Goring (1912–1998), English actor
- Marius Jouveau (1878-1949), French poet
- Marius Lăcătuş (born 1964), Romanian footballer
- Marius von Mayenburg (born 1972), German actor
- Marius Mitrea (born 1982), Romanian–Italian rugby union referee
- Marius Müller-Westernhagen (born 1948), German musician and actor
- Marius Petipa (1819–1910), French-Russian ballet dancer / choreographer
- Marius Roustan (1870-1942), French politician.
- Marius Russo (1914–2005), American baseball player (pitcher)
- Marius Sestier (1861–1928), French cinematographer
- Marius Trésor (born 1950), French footballer
- Marius Urzică (born 1975), Romanian gymnast
Fictional or legendary characters