Home / Music / What was Beethoven's last completed major work?Music linernotes album music ludwig-van-beethovenWhat was Beethoven's last completed major work?Op. 135 was Beethoven’s last completed major work, completed in October 1826. Search Amazon As an Amazon Associate I earn from qualifying purchases.Related NotesExploreExploreExplorePrevious What was Joni Mitchell's only top-ten single from Court and Spark?Next What unreleased Roger Waters track appears on the album Vagabond Ways?