Marais means "marsh" in the French language.
Marais may also refer to:
- Marais (company), a manufacturer of wheel trenchers, chain trenchers and micro-trenchers based in Durtal, France
- Marais des Cygnes (disambiguation)
- Marais La Nuit, a song from the album Middle Cyclone by American recording artist Neko Case
- Le Marais (song), a song written in both English and French by Irish songwriter Liz Madden
- Sarie Marais, a traditional Afrikaans folk song
- Théâtre du Marais, the name of several theatres and theatrical troupes in Paris, France