The 2008–09 Scottish Football League Third Division (also known as the 2008–09 Irn-Bru Scottish Football League Third Division for sponsorship reasons) was the 14th season in the format of ten teams in the fourth-tier of Scottish football. The season started on 2 August 2008 and ended on 9 May 2009. Dumbarton F.C. finished top and were promoted alongside Stenhousemuir F.C. as play-off winners.Cowdenbeath F.C. were also promoted due to Livingston being demoted to the Third Division.