Arnout Henricus Elisabeth Maria "Nout" Wellink (born 27 August 1943 in Bredevoort, Netherlands) is a Dutch economist and former central banker.
In 2010, Financial News determined that Wellink as the one man who is believed to have wielded the greatest influence on worldwide financial oversight including "game-changing proposals on capital requirements and liquidity" for the world’s banks. He was President of De Nederlandsche Bank (DNB), a Director of the Bank for International Settlements (BIS) from 1997 to 2012 and Chairman of the Board from 2002 through 2006. Also, Wellink was a member of the Governing Council of the European Central Bank from 1999 to 2012, a Governor of the International Monetary Fund (IMF) and a member of the Financial Stability Board (FSB). Since October 2012 he has been a member of the board of the Bank of China.
He studied law at Leiden University from 1961 to 1968. He was awarded a Ph.D. degree in economics from Erasmus University Rotterdam in 1975.
From 1970 to 1982, Wellink worked at the Dutch Ministry of Finance. He rose through the bureaucracy to become Director General of Financial and Economic Policy. He also held the post of Treasurer General.
In 1982, he became Executive Director of De Nederlandsche Bank (DNB), the central bank of The Netherlands. In 1997, he was named president of the bank. On 1 July 2011 his second term as president of DNB ended.
In 2000, Wellink became a member of the Trilateral Commission.