Peter Kenneth Estlin (born July 1961) is an alderman of the City of London Corporation where he represents the ward of Coleman Street. Estlin is an advisor to Barclays plc. He was educated at King Edward's School, Witley and the University of Bristol. He became chartered accountant and partner with Coopers & Lybrand in 1993. He was chief financial officer for Salomon Brothers Asia, and then for Citigroup Investment Banking and Banking divisions in New York and London. He joined Barclays bank in 2008 and has been Acting Group CFO.