Sir Andrew Stewart Mackenzie FRS[4] (born 20 December 1956[5][1]) is a Scottish businessman, who is the chairman of Shell plc and formerly CEO of BHP Billiton, the world's largest mining company.

[16] Australia mining head Mike Henry succeeded Mackenzie as BHP CEO on 1 January 2020.

[18] In March 2021, Mackenzie was tapped to replace Chad Holliday as company chair of Royal Dutch Shell starting May 2021.

[19] In June 2021, Mackenzie was selected to be Chair of UK Research and Innovation to replace Sir John Kingman.

For most of his career he has been a leader in the energy and mining industries working within BP, Rio Tinto and most recently in BHP Billiton.

He has made major innovations in both technical and business arenas within these companies, and is pre-eminent as an earth scientist in the commercial world.