In the Dungeons and Dragons World of Greyhawk Campaign setting, Oerik is the largest continent on the world of Oerth, where the Greyhawk campaign takes place.
Oerik is named after the Oeridians, a human people who settled much of the continent. The best-known part of Oerik is the eastern portion, known as the Flanaess, named after the first human settlers to that region, the Flan.
A lesser-known region, Western Oerik, was described in materials for the Chainmail game from 2001-2002.