Ernest Arthur Graham Mackay (26 July 1949 – 18 December 2013) was a South African businessman, former chief executive and chairman of SABMiller plc, a South African multinational brewing and beverage company registered on the London Stock Exchange, and the world's second-largest brewing company measured by revenues.

Born in Johannesburg in 1949,[1] the son of Gavin and Mary Mackay, he was educated at St Andrew's College, Grahamstown, South Africa, and University of the Witwatersrand, Johannesburg, with BSc (Engineering) and BCom degrees.

[2] By raising its long-standing chief executive Mackay to chairman, SAB Miller was widely considered to have breached City convention and traditional corporate governance practices, which do not allow a chief executive to become chairman without a good explanation.

Corporate governance codes also discourage the chairman being a full-time executive, as Mackay will be for a year.

He was appointed group managing director in 1997 and chief executive of South African Breweries plc upon its 1999 London Stock Exchange listing.