William Mackay Malarkey (18 June 1951– 20 February 2020) was a Manx politician, who was elected Liberal Vannin MHK for Douglas South but later defected from the party and sat as an independent. In the 2011 general election he lost his seat to Liberal Vannin candidate Kate Beecroft. He was re-elected at a by-election in May 2015 as an independent candidate, and retained his seat for Douglas South in September 2016. Bill Malarkey died on 20 February 2020. He had been suffering from cancer for some time.