Olga () is an urban locality (an urban-type settlement) and the administrative center of Olginsky District of Primorsky Krai, Russia, located on the Olga Bay of the Sea of Japan, northeast of Nakhodka. Population:
During the Balhae Kingdom period, a town called Anju was founded near present-day Olga on the shores of Olga Bay.
The Russian military post of Olga was established in 1858, several months after the region passed to Russia under the terms of the Treaty of Aigun. It was named after St. Olga. In the 19th century, the settlement had a significant Chinese minority. The town's name is similar to that of the eldest daughter of Nicholas II.