Eggøya ("Egg Island") is a peninsula of Jan Mayen island of the Arctic Ocean. It is located on the southern side, in the central part of the island, east of Sørlaguna, and defines the northeastern extension of the bay Rekvedbukta. To the west of the peninsula is the bay Eggøybukta, and to the east is the bay Jamesonbukta. The highest peak at the peninsula has a height of 217 m.a.s.l. Eggøya consists of the northern part of an old volcanic crater, and small hydrothermal vents are still present. The outer part of the peninsula forms the semicircular bay of , facing south-southeast with steep slopes. To the south of the peninsula is a small islet, Eggøykalven.