Marc "Boy-boy" Wallenberg was a Swedish banker and business manager. A member of the prominent Wallenberg family, Marc Wallenberg was CEO of Stockholms Enskilda Bank until his death in 1971.

The Wallenberg family is a prominent Swedish family renowned as bankers, industrialists, politicians, bureaucrats and diplomats, present in most large Swedish industrial groups, like Ericsson, Electrolux, ABB, SAS Group, SKF, AIK, Atlas Copco, Saab AB, and more. In the 1970s, the Wallenberg family businesses employed 40% of Sweden's industrial workforce and represented 40% of the total worth of the Stockholm stock market.