"One Day" is a song by British musician Vince Clarke and Scottish singer Paul Quinn, released as a one-off collaboration single in 1985.

The duo intended to record a full album using a variety of different singers, however no further collaborations were negotiated, and Clarke and Radcliffe eventually agreed to pursue their own projects.

[6][7] During 1984, Clarke approached two singers for a possible collaboration, but nothing materialised, while a session with Jamie Morgan and Cameron McVey resulted in the writing of "One Day".

"[10] Upon release, Chris Heath of Smash Hits described the single as "very good" and commented: "Paul Quinn tries very hard to sing like David Bowie over the same 'ker-plunk ker-plunk' synth backing that Clarke has used since his Depeche Mode and Yazoo days.

[8] Anne Lambert of Number One stated: "Paul teamed up with Edwin from Orange Juice last year for the lovely "Pale Blue Eyes" which didn't get anywhere.

[10] Graham K. Smith of Record Mirror considered the song the "first flop" of Clarke's "brilliant career" and commented: ""One Day" has all the ingredients that made "Never Never" a mega but has suffered serious problems in the preparation and cooking.