"Tell Me When" is a song by English synth-pop band the Human League, released in December 1994 by East West Records as the first single from their seventh album, Octopus (1995). Written jointly by lead singer Philip Oakey and Paul C. Beckett, the song was produced by Ian Stanley. It peaked at number six on the UK Singles Chart, while reaching number four on the UK Dance Chart. In the US, it peaked at number 31 on the Billboard Hot 100, number 15 on the Billboard Hot Dance Club Play chart and number eight on the Cash Box Top 100. The music video for the song was directed by Andy Morahan and filmed in the Czech Republic.