Mark Jeffrey Wilson (born August 1980) is an Australian musician, originally from Geelong. From 2002 to 2012, and since their 2017 comeback, he has played bass guitar for the Melbourne-based rock band, Jet. He was asked to join them by three founding members, Nic Cester, Chris Cester and Cameron Muncey, but initially refused out of loyalty to his then-current group, The CA$inos. Days later he rang up Muncey and the Cesters and agreed to join their group instead.