Nicholas William "Nick" Leeson (born 25 February 1967) is a former English derivatives broker famous for bringing down Barings Bank, the United Kingdom's oldest merchant bank, into bankruptcy.
A rogue trader who made fraudulent, unauthorised and speculative moves, his actions led directly to the 1995 collapse of Barings Bank, for which he was sentenced to a term of imprisonment.
Between 2005 and 2011 he had management roles at League of Ireland club Galway United.
He is also active on the keynote and after-dinner speaking circuit, where he advises companies about risk and corporate responsibility.
He competed in the UK Celebrity Big Brother 2018, where he finished in fourth place.