The Forgotten Arm is the fifth album by singer-songwriter Aimee Mann, with illustrations by artist Owen Smith.

It is a concept album, telling the story of two characters who run off with each other to escape their problems, but end up in more trouble than either of them could have imagined.

The album won the 2006 Grammy Award for Best Recording Package for Mann and Gail Marowitz (art directors).

"[10] Trouser Press gave it a positive review and said, "Some of the songs are immediately engrossing... Others mostly carry the story forward while allowing Mann to indulge her career-long taste for vintage keyboard orchestration, coolly elegant pop arrangements and displays of tart wordplay.

Club gave it an unfavorable review and said, "Mann's signature wordplay sounds clichéd and exhausted, and her melodies lack the energy and pop sparkle that distinguished her pre-Lost In Space work.