Dial-A-Song: 20 Years Of They Might Be Giants is a 2002 compilation album by American alternative rock band They Might Be Giants, issued by Rhino Records and compiled by the band's co-singer/songwriter and guitarist John Flansburgh. Despite its name, the compilation does not include tracks from the band's "Dial-A-Song" service. It is instead an anthology of various single, album and live tracks from the band's history, spanning their full career up to the time of its release. It includes tracks from every album starting with 1986's They Might Be Giants up through No!, their first children's album, which was released only three months before this compilation.
The first disc focuses mainly on the group's singles and better-known album tracks, while disc two delves into more obscure fan favorites and live cuts.