No, Warren Buffett, the Oracle of Omaha, and (according to Forbes) the richest person in the world, is not a Jew.
Warren Buffett is an avowed agnostic.
He was raised as a Presbyterian. His father was a Presbyterian who served in Congress as a far-right Republican. Buffett attended Sunday School as a Presbyterian.
Warren does not subscribe to his family's religion.
In the 1950's Buffet was friendly with and played bridge with his Omaha neighbors, Rabbi Myer and Mrs. Kripke. Over the years Buffet has had many links to Jews and the Jewish community in Omaha.
In 2006 Buffet bought an 80 percent share in the Israeli metalworks conglomerate, Iscar, for $4 billion. /repost from 9/24/08/