Sir Thomas Stuart Legg KCB KC (13 August 1935 – 8 October 2023) was a British senior civil servant, who was Permanent Secretary of the Lord Chancellor's Department and Clerk of the Crown in Chancery, United Kingdom (1989–98).
After National Service in the Royal Marines from 1953 to 1955, under the military education system he read history and law at St John's College, Cambridge.
In 1998, then Cabinet Secretary Sir Robin Butler asked Legg and Sir Robin Ibbs to conduct an inquiry into allegations that British company Sandline International was trying to sell arms to the government in exile in Sierra Leone, contravening an international embargo.
In what became known as the "arms to Sierra Leone" affair, the inquiry cleared the British Government of any underhand conspiracy with Sandline, prompting accusations of a whitewash.
[3] As a member of the Audit Commission, and member of the House of Commons Audit Committee, in 2009, in the wake of the United Kingdom Parliamentary expenses scandal, Legg was appointed to chair an independent panel with a remit to examine all claims relating to the second homes allowance between 2004 and 2008.