Rottumerplaat is an uninhabited small island of the province of Groningen, the Netherlands. It belongs to the municipality of Eemsmond. It covers an area of 7.8 km².
Rottumerplaat makes part of the West Frisian Islands (Dutch: Waddeneilanden).
It lies west of the small island of Rottumeroog and east of the island of Schiermonnikoog.