Sir Nigel Leonard Wicks GCB CVO CBE (born 16 June 1940) is a British financier and former senior British civil servant, currently serving as Chairman of Euroclear.
Educated originally at Beckenham and Penge Grammar School, Wicks joined British Petroleum in 1958 at the age of 18. Whilst at BP, Wicks studied for a University of London external MA in business administration at the Portsmouth College of Technology, now part of the University of Portsmouth.
After 10 years at BP, Wicks joined HM Treasury in 1968. At the Treasury, Wicks undertook a number of positions including secondments to the Prime Minister's Office as a Private Secretary to the Prime Minister (1975–1978, under Callaghan and Wilson) and at the British Embassy in Washington, D.C. as Economic Minister (and so the UK's Executive Director of the IMF and IBRD) from 1983–1985.
In 1985, Wicks took up his position as Principal Private Secretary to the Prime Minister, Margaret Thatcher, a post he held for three years until returning to the Treasury as Second Permanent Secretary with responsibility for International Finance, where he remained for twelve years until reaching mandatory retirement age in 2000. After Wick's retirement, the Treasury's International Finance command was merged into that of Macro-Economic Policy, led by Gus O'Donnell (later The Lord O'Donnell).