Yandex LLC (Russian: Яндекс) is a Russian multinational technology company providing Internet-related products and services, including an Internet search engine, information services, e-commerce, transportation, maps and navigation, mobile applications, and online advertising. It primarily serves audiences in Russia and the Commonwealth of Independent States of the former Soviet Union, and has more than 30 offices worldwide.

The firm is the largest technology company in Russia and the second largest search engine on the Internet in Russian, with a market share of over 42% It also has the largest market share of any search engine from Europe and the Commonwealth of Independent States and is the 5th largest search engine worldwide after Google, Bing, Yahoo!, and Baidu. Its main competitors on the Russian market are Google, VK, and Rambler.

Yandex LLC's holding company, Yandex N.V., is registered in Amsterdam, the Netherlands as a naamloze vennootschap (Dutch public limited company), has its registered office in Schiphol Airport, and is listed in Nasdaq with a secondary listing in the Moscow Exchange.