Baruch Samuel "Barry" Blumberg (July 28, 1925 – April 5, 2011) was an American doctor of Jewish descent.
He is best known for the research he did on the Hepatitis B virus. He won the Nobel Prize in Physiology or Medicine in 1976 for "discoveries concerning new mechanisms for the origin and dissemination of infectious diseases". He shared the prize with Daniel Carleton Gajdusek.
He died on April 5, 2011 a short while after he gave the keynote speech at the International Lunar Research Park Exploratory Workshop held at NASA Ames Research Center.