Ocna ("the salt mine") may refer to several places in Romania:
Ocna Mureș, a town in Alba County Ocna Sibiului, a town in Sibiu County Ocnele Mari, a town in Vâlcea County Târgu Ocna, a town in Bacău County Ocna de Fier, a commune in Caraș-Severin County Ocna Șugatag, a commune in Maramureș County Ocna de Jos and Ocna de Sus, villages in Praid Commune, Harghita County Ocna Dejului, a village in Dej city, Cluj County
and to:
Ocna, the Romanian name for Vikno, Zastavna Raion, Ukraine