Robert Sam Weil (born 21 November 1948 in Bromma, Stockholm Municipality) is a Swedish businessman and philanthropist.He is the chairman of the investment company Proventus, which he founded in 1980. He is also chairman of Magasin 3 Stockholm Konsthall, and the Jewish Theatre in Stockholm, and a member of the international advisory board for the Batsheva Dance Company in Tel Aviv. He is also chairman of the Jewish Cultural Heritage Foundation, which he founded in 2005.
He was awarded the 1975 Joseph Jefferson Award for Best Actor in a Supporting Role in a Musical for "My Fair Lady" at the Candlelight Forum Theatre in Chicago, Illinois.