The Honourable Anna Elizabeth Blackstock Walker CB (born 1951) is a British senior civil servant and regulator of services. Walker is married to Timothy Walker,^[1] with whom she has three adult children.^[2] She is the daughter of Lord Butterworth.^[1]

Walker succeeded Chris Bolt as chair of the Office of Rail Regulation on 5 July 2009 when Bolt's five-year term of office expired.^[3] In this role, Walker was the IRG-Rail Chair for 2013; the members of IRG-Rail consist of the independent Regulatory Bodies of twenty-one countries inside and outside the European Union. She stepped down from this role in 2015 and was replaced by Stephen Glaister.^[4]

She was Chief Executive of the Healthcare Commission from its formation on 1 April 2004 until 31 March 2009, when the commission was abolished and its functions in England were broadly subsumed by the Care Quality Commission.

• 2009–2016 Chair, Young Epilepsy^[5]
• 2009–2015 Chair, Office of Rail Regulation^[3]
• 2008–2012 Board member and vice chair, Consumer Focus^[6][7]
• 2004–2009 Chief Executive, Healthcare Commission^[6]
• 2001–2003 Director-General for Rural Affairs, Department for Environment, Food and Rural Affairs
• 1998–2001 Director-General for Energy, Department of Trade and Industry
• 1994–1997 Deputy Director-General, Oftel
• 1975–1994 Civil Servant, mostly at Department of Trade and Industry
• 1972–1973 British Council

• Lady Margaret Hall, Oxford (MA History)
• Bryn Mawr College, US
• Benenden School, Kent
• Oxford High School