Bachelor No. 2 or, the Last Remains of the Dodo is the third album by the American singer-songwriter Aimee Mann, released on May 2, 2000. Some songs were previously released on the Magnolia soundtrack (1999), which Mann wrote in the same period. "The Fall of the World's Own Optimist" was co-written with the English singer-songwriter Elvis Costello.

Mann's previous albums had not been successful, and her record label, Geffen Records, refused to release Bachelor No. 2, feeling it contained no hit singles. In response, Mann set up her own label, SuperEgo, and released it herself. Bachelor No. 2 sold 270,000 copies, a large number for an independent artist.

According to Metacritic, Bachelor No. 2 is the 28th best-reviewed album and the ninth best-reviewed alternative album of the decade, and Slant Magazine named it the decade's 100th-best album. The success established Mann as a career artist who could work outside of the major label system.