Sir David Alan Walker (born 31 December 1939) is a British banker and former chairman of Barclays.
He served on the staff of the International Monetary Fund in Washington from 1970–73, and was assistant secretary in HM Treasury from 1973–77.
Walker held positions with the SIB from 1988–92 and the Agricultural Mortgage Corporation from 1993–94, and was deputy chair of Lloyds Bank from 1992–94.
He has chaired the Russian Venture Company (RVC) Greenhouse Fund since 1999, and was non-executive director at National Power in 1990 and from 1993–94.
He belonged to the Moroccan British Business Council from 2000–07, and has been a chairman of the University of Cambridge 800th Anniversary Campaign since 2005.
Walker was a governor of Henley Management College from 1993–99 and chaired Community Links, an East End charity.