Uuemaarahu is a small, Baltic Sea islet comprising 0.0234 hectares^[1] belonging to the country of Estonia.

Uuemaarahu lies 1 kilometer to the southeast of the island of Hellamaa in the Väinameri Strait. It belongs to the administrative municipality of Pühalepa Parish, Hiiu County (Estonian: Hiiu maakond) and is part of the Hiiumaa Islet Landscape Reserve.^[2] Other islands nearby include Uuemererahu, Kadakalaid, Ramsi, Hõralaid and Vohilaid.

The islet is an important moulting area for an abundant variety of birds such as: the mute swan, the great black-backed gull, the common gull, the oystercatcher, the Arctic tern, the common eider, the greylag goose, the common goldeneye, the mallard, the goosander, the ruff, the black-tailed godwit, and the barnacle goose.^[3]