Olimarao Atoll is an uninhabited atoll with a land area of 0.2 km<sup>2</sup> in the State of Yap in the Federated States of Micronesia. It is located 36 kilometers northwest of Elato and 860 kilometers southeast of Yap island. Olimarao belongs administratively to Elato.
The name of the island goes back to Proto-Chuukic *weni-maraawu.
The atoll's surface is 11 km<sup>2</sup> and it is roughly 5 km long and 3 km wide. The lagoon has a surface of about 6 km<sup>2</sup> and two passages into it located in the southern fringes of the reef.
There are only two small islets (Motus) on the reef, with a total surface of 0.2 km<sup>2</sup> (20 hectares):
Both islands have coconut palms, among other vegetation, like Scaevola taccada bushes.
The whole atoll is part of the Olimarao Conservation Area. This zone is meant to protect the breeding places of sea turtles, coconut crabs and pelagic birds.