Rottumeroog is an uninhabited small island of the province of Groningen, the Netherlands. It belongs to the municipality of Het Hogeland. It covers an area of 2.5 km².
Rottumeroog makes part of the West Frisian Islands (Dutch: Waddeneilanden). It is the most eastern island.
It lies west of the German island of Borkum and east of the small island of Rottumerplaat.