40 Odd Years is a compilation box set by American singer-songwriter Loudon Wainwright III, released on May 3, 2011 on Shout!

The set contains music from throughout Wainwright's career, alongside a DVD of live performances and documentary pieces.

[1] The album's fourth disc features both rare and unreleased tracks, including a newly recorded song for the collection, entitled "Dead Man".

Regarding filmmaker Judd Apatow's involvement in 40 Odd Years, Wainwright noted, "I would see him and he would say, "You gotta have a box!"

"[3] On the album's fourth disc of rarities, Wainwright included a duet with him and his ex-wife Kate McGarrigle, entitled "Weave Room Blues".