Paviken is a lake near Västergarn on western Gotland. The lake and its surroundings form the nature reserve Paviken.
During the Viking Age, Paviken was a cove connected to the Baltic Sea. It formed a natural harbour which was improved by jetties. These were built during the 8th century and were used for about 300 years until the harbour became too shallow, when the harbour and trade was moved to Västergarn.