Sir Leonard "Len" Blavatnik (born June 14, 1957) is a Soviet-born British-American businessman, investor, and philanthropist. He made his fortune through business via diversified investments in myriad companies through his conglomerate company, Access Industries.

In 2015, he was named Britain's richest man with an estimated net worth of £17.1 billion as of April 2015.[3] In 2017, Blavatnik received a knighthood for services to philanthropy.

Blavatnik was born in Odessa to a Jewish family.[4][5]  His family emigrated from Soviet Union to the United States in 1978, and he received a masters in computer science from Columbia University and an MBA from Harvard Business School in 1989.[6][4]