Sir Ian Maurice Gray Prosser (born 5 July 1943) is a British businessman.^{[citation needed]}

Prosser was born in Bath, England and educated at King Edward's School, Bath, Watford Grammar School for Boys and Birmingham University.^{[citation needed]}

He retired in 2021 from positions of Chairman BP Pension Trustees, Chairman Navy Army & Airforce Institute and Chairman of GamCare.^[1] He was Chairman & CEO of Bass Brewery and latterly Chairman of IHG Hotels & Resorts until his retirement in 2003.^[1] He is a former non-executive Deputy Chairman of BP, having joined as a non-executive Director in 1997 and retired on 15 April 2010. He was formerly senior independent director of GlaxoSmithkline, a non-executive director of Boots, of Lloyds TSB.^{[citation needed]} Hillshire brands (formerly Sara Lee) Chairman of the Aviva Staff Pension Scheme and Chairman of Navy, Army & Air Force Institute.

Prosser received his knighthood in the 1995 New Year Honours list.^{[citation needed]} Prosser was awarded an honorary DUniv by the University of Birmingham in 2001.^[2]