Allan William Buchanan Gray (8 April 1938 – 10 November 2019) was a South African billionaire businessman and philanthropist. He founded the privately owned investment management company named after him, and the non-profit Allan Gray Orbis Foundation, and the Allan and Gill Gray Charitable Trust. Before he donated his stake in the Allan Gray investment management company, his net worth was estimated to have been US$1.8 billion in 2017.