"Blue Day" is a song by New Zealand group Mi-Sex, released in February 1984 as the second single from their fourth studio album, Where Do They Go?

The song peaked at number 24 in Australia.

Australia/New Zealand 7" (BA 223149)[1] Australia 12" (BA 12069) United Kingdom 7" (CBS – A4302) In 1999, New Zealand artist Nicolette recorded an "upbeat dance version" the song, which peaked at number 20 on the New Zealand charts, much to the delight of Mi-Sex's member Colin Bayley, whom Nicolette has been busy writing songs with in Sydney.

[3] In 2014, Australian band FreedomBLUE recorded a version of the song which aired that year on Channel Seven's annual Telethon weekend; a 24-hour annual televised fundraiser for children's hospitals.

This 1980s pop song-related article is a stub.