The Social Market Foundation (SMF) is an independent British political public policy think-tank based in Westminster, London.

[5] The Foundation's first executive director was the 'continuing' SDP peer Lord Kilmarnock, and its chairman from 1991 was Robert Skidelsky, Professor of Political Economy at Warwick University, who was responsible for much of the Owenite SDP's economic policy, having written a green paper on the social market economy for the party's first conference in September 1988.

[5][6] Following the demise of the 'continuing' SDP in 1990, the Foundation gravitated to the post-Thatcher Conservative Party, and in press circles it was often cited as "John Major's favourite thinktank".

[citation needed] In September 2010 Mary Ann Sieghart, the political and social affairs journalist, took over as Chair.

[citation needed] The SMF has a 20 member Policy Advisory Board, which as of 2018 included the Members of Parliament (MPs) Stephen Kinnock, Norman Lamb, Chris Leslie, Alison McGovern, Tom Tugendhat, Chuka Umunna and John Woodcock.