Three into One is the first compilation album from the band Ultravox, released in 1979 in the USA and in June 1980 in the UK. The album is a compilation of songs from their first three albums, Ultravox!, Ha!-Ha!-Ha! and Systems of Romance, and therefore concentrates on the earlier incarnation of the band from the 1970s featuring John Foxx, as opposed to the more recognisable 1980s line-up which featured Midge Ure.
The vinyl version and CD version of the song "Quiet Men" are different. The version on vinyl comes from the single with the same name and has the abrupt end, while the CD version is longer and fades out at the end.