Brian David Mason ECA (born October 12, 1953) is a Canadian politician who was leader of the Alberta New Democratic Party from 2004 to 2014 and served the Minister of Transportation in Rachel Notley's NDP government.

While there he boarded at the traditionally Tory fraternity Phi Gamma Delta and was roommates with future Progressive Conservative Premier Dave Hancock, who teased him by calling him a communist.

Mason's campaign came with a legal challenge he mounted against a provincial law forbidding municipal employees from running as candidates in a civic election unless they resigned their position with the city.

[6] Shortly after the election the law Mason challenged was repealed, and municipal workers in Edmonton were subsequently allowed to run for civic office without resigning their positions.

[7] In 2000, following the mid-term resignation of then leader of the Alberta New Democrats and MLA for Edmonton Highlands Pam Barrett, Mason left city council and ran for the NDP in the ensuing by-election.

Mason held his seat during the provincial election in 2004, which saw the caucus welcome the return of former leaders Pannu and Ray Martin, along with newcomer David Eggen.

During the final few months of Mason's tenure the party was already enjoying strong polling in Edmonton, something which would eventually grow into the larger electoral sweep that the Alberta NDP managed in the 2015 provincial election under Mason's successor Notley that resulted in the formation of Alberta's first ever NDP government.