"A Red Letter Day" is a song by English synth-pop duo Pet Shop Boys, released on 17 March 1997 as the fourth single from their sixth studio album, Bilingual (1996). The single peaked at number 9 on the UK Singles Chart, making it another top 10 single for the group. However, it then fell straight out of the UK top 40 (to number 42) the following week. At the time, this was a record as the biggest such fall to ever occur in UK chart history, but it was then beaten the following year by Embrace with their single "My Weakness Is None of Your Business" (which fell from number 9 to 44 the following week).