Marcus Ambrose Paul Agius CBE (/ˈeɪdʒəs/; born 22 July 1946) is a British financier and former group chairman of Barclays.

He earned his degree in Mechanical Sciences and Economics at Trinity Hall, Cambridge,[5] and also holds an MBA from Harvard Business School.

On 1 September 2006, Agius joined the Barclays board as a non-executive director and succeeded Matthew Barrett as chairman from 1 January 2007.

From December 2006 to 2012 Agius was a senior independent non-executive director of the BBC's executive board.

[citation needed] Agius was appointed Commander of the Order of the British Empire (CBE) in the 2021 New Year Honours for services to botany and conservation.