Marna may refer to:
Places Marna, Estonia, a village in Viljandi County Marna, Goa, a village in India Marna, Minnesota, an unincorporated community in Faribault County, Minnesota, U.S. Marna (river), or Mandalselva, in Agder county, Norway
Other MV Marna, later MV Ricardo Manuela, a British coaster
See also Marnas, or Dagon, a god worshipped in Gaza in antiquity