Plavna ( Serbian Cyrillic: Плавна) is a village in Serbia. It is situated in the Bač municipality, in the South Bačka District, Vojvodina province. Its population is ethnically mixed and numbering 1,392 people (2002 census).
Plavna is a village in the municipality of Negotin, Serbia. According to the 2002 census, the village has a population of 953 people.