Michael Klein may refer to: Michael L. Klein (born 1940), professor of chemistry at Temple University, member of the US National Academy of Sciences Michael Klein (businessman) (born 1951), CEO of the Casas Bahia chain of stores in Brazil Michael Klein (writer) (born 1954), faculty in English at Goddard College in the US Michael Klein (art dealer) (born 1952), former curator of the Microsoft Art Collection, Director of the International Sculpture Center Michael Klein (World Bank official) (born 1952), author and former World Bank official Michael Klein (footballer, born 1959) (1959–93), Romanian football player, played in Romania and at Bayer Uerdingen Michael Klein (footballer, born 1965), German football player with Eintracht Frankfurt Michael R. Klein, American securities lawyer and co-founder of the Sunlight Foundation as well of chair of Sunlight's board