The Shadow Chancellor of the Exchequer in the British Parliamentary system is the member of the Shadow Cabinet who is responsible for shadowing the Chancellor of the Exchequer. The title is in the gift of the Leader of the Opposition but is informal. The Shadow Chancellor has no constitutional role.
The name for the position has a mixed history. It is used to designate the lead economic spokesman for the Opposition, although some Shadow Cabinets have not used the term (the Thatcher Shadow Cabinet in the Conservative Party Campaign of 1979). As a consequence of this and of the rise of the Liberal Democrats (who in opposition prior to being in coalition government used the title themselves) the term is used interchangeably with 'Economic Spokesman' for both parties.