Ostrovok.ru is a Russian online hotel booking service, founded in 2010 by Serge Faguet and Kirill Makharinsky. It has over one million accommodation options. The number of users of the service was estimated at 5.4 million people in August 2018, according to SimilarWeb. The company’s turnover in 2018 amounted to $713 million. Partners of Ostrovok.ru include the companies Megafon, HotelsCombined, TripAdvisor, Sheremetyevo Airport, Aviasales, and Kayak. The head office of the company is located in Moscow.