Jacob "Juju" Wallenberg KmstkVO KmstkNO (27 September 1892 – 1 August 1980) was a Swedish banker and industrial leader.

He was also voting trustee in the International Match Realization Co. Ltd[7] and was on the board of the National Institute of Economic Research (from 1937)[8] and of the Maritime Museum in Stockholm (from 1939).

[13] He was a board member of AB Iggesunds Bruk, Nordiska Kompaniet (NK), Skandia, Göta kanalbolag, Wikmanshytte Bruks AB, the Nobel Foundation (from 1952), the Knut and Alice Wallenberg Foundation and King Gustaf V's Jubilee Fund.

After the death of his parents, Wallenberg inherited Malmviks Estate in Lovön, which became one of his permanent homes.

In 1978 he donated Malmvik Estate to the Marcus and Amalia Wallenberg Memorial Fund Foundation.

His boats, built at August Plym's boatyard in Neglinge, Saltsjöbaden, were named Refanut.

The favorite sailor, for half a century, Calle Lindberg from Möja, he appreciated greatly, as well as boat builders Tore Holm and Arvid Laurin.

[17][18] He was chairman of the Royal Swedish Yacht Club (KSSS) for many years and initiated in 1962 Jacob Wallenberg's Naval Academy Fund (Jacob Wallenbergs Sjökrigsskolefond) for the education of students at the Royal Swedish Naval Academy.