Nicol Ross Stephen, Baron Stephen (born 23 March 1960) is a Scottish politician who served as Deputy First Minister of Scotland and Minister for Enterprise and Lifelong Learning from 2005 to 2007. A member of the Scottish Liberal Democrats, he was the Member of the Scottish Parliament (MSP) for Aberdeen South from 1999 to 2011, and was leader of the Scottish Liberal Democrats from 2005 to 2008.