The 2012–13 Terceira Divisão season was the 63rd season of the competition and the 23rd season of recognised fourth-tier football in Portugal. It was the last edition of the competition as Campeonato Nacional de Seniores was created in 2013 to replace the Segunda Divisão and Terceira Divisão (third and fourth tier of the Portuguese football league system respectively) for the 2013–14 season.