Marusia, Marusja, or Marusya may refer to:
- People
- Marusia Churai (1625–1653), Ukrainian Baroque composer, poet, and singer
- Marusya Klimova (born 1961), Russian writer and translator
- Maria Nikiforova, widely known as Marusya (1885–1919), Ukrainian anarchist partisan leader
- Marusya Ivanova Lyubcheva (born 1949), Bulgarian politician
- Fictional characters
- Marusia, a character in The Fiend
- Marusja, a character in The Magic Mountain
- Other
- Marusia massacre 1925 Chilean government crackdown during a mining strike
- Letters from Marusia, 1976 Mexican film
See also
- Maruša, Slovene cognate