Donald Robert Argus AC (born 1 August 1938) is an Australian businessman, Chairman of Bank of America Merrill Lynch Australia Advisory Board and Member of the Bank of America Global Advisory Council. He is the former Chairman of BHP Billiton (1999-2010) and Brambles (1999-2008), former Director of the Australian Foundation Investment Company (1999-2013) and former CEO of National Australia Bank (1991-1999).