Olga Bay (Russian: Залив Ольга or Залив Ольги, 43°41′56″N 135°15′04″E / 43.69889°N 135.25111°E) is a small (11x4 km) bay in the Sea of Japan at the east coast of Primorsky Krai.
Olga Bay was discovered in 1859 by the Russian corvette Amerika and named after Saint Olga.
There are port Olga on the northern coast of the bay and mouth of Avvakumovka River in the western part.
The northern part of Olga Bay (Tihaya Pristan lit. Calm or Quiet Wharf) is highly protected from winds and waves.