Mark James Littlewood (born 28 April 1972) is the director general of the libertarian, free market think-tank, the Institute of Economic Affairs (IEA). He has formerly been the chief press spokesman for the Liberal Democrats and the Pro-Euro Conservative Party and was an advisor to Conservative Party under Prime Minister David Cameron. Having previously been in favour of deeper European integration, Littlewood later adopted a eurosceptic position and advocated voting Leave in the 2016 referendum on Membership of the European Union.