David Richard Swann is a Canadian medical doctor and politician. 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 1 February 2015, following the resignation of Raj Sherman and led the party through the 2015 provincial election.

The Alberta Liberal Party is a provincial political party in Alberta, Canada. Founded in 1905, it is the oldest active political party in Alberta and was the dominant political party until the 1921 election, with the first three provincial Premiers being Liberals. Since 1921, it has formed the official opposition in the Legislative Assembly of Alberta several times, most recently from 1993 until 2012. Fourteen Liberals have served as Leader of the Opposition of Alberta.