William "Bill" Mackay Malarkey (born 18 June 1951) is 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.
Re-elected at by-election in May 2015 as an independent candidate.
Retained seat for Douglas South in September 2016.