Sir Leonard Valentinovich Blavatnik[a] (Ukrainian: Леонард Валентинович Блаватник; born June 14, 1957) is a Soviet/Ukrainian-born British-American businessman and philanthropist. As of April 2025, Forbes estimated his net worth at $26.5 billion, ranking him the 75th-richest person in the world. In 2017, Blavatnik received a knighthood for services to philanthropy.

Blavatnik made his initial fortune, alongside other Russian oligarchs, in the privatization of state-owned aluminum and oil assets after the collapse of the Soviet Union. He owns most of Warner Music Group and has stakes in several publicly traded assets via his privately held Access Industries.

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