David Richard Swann, MLA (born June 19, 1949) is a medical doctor and Alberta Liberal Member of the Legislative Assembly for Calgary-Mountain View. He was the leader of the Alberta Liberal Party and Leader of the Opposition in the Alberta Legislature from December 2008 until resigning as party leader in September 2011. He returned as interim leader of the Alberta Liberal Party on February 1, 2015, following the resignation of Raj Sherman and led the party through the 2015 provincial election.