"Isn't It Midnight" is a song by Fleetwood Mac, taken from their 1987 album Tango in the Night. The song was co-written and sung by Christine McVie, with contributions from Lindsey Buckingham and her then-husband Eddie Quintela. It was the sixth and final single to be released from the album in 1988. The cover of the single features the portrait of Mademoiselle Caroline Rivière.

In the United Kingdom, "Isn't It Midnight" was released as the follow-up to "Everywhere" and it charted at its peak position of number 60 on 18 June 1988. It performed better in Ireland, where it reached the top 30, peaking at number 23. The song was also released as a single in the United States in both its original album cut and as a live performance culled from the Tango in the Night concert filmed at Cow Palace. The former version charted at number 14 on the Billboard Mainstream Rock chart while its live variant appeared at number 86 on the Billboard Hot 100.

This was the second official Fleetwood Mac song to be released on the 3-inch CD single format as well being issued on 7" and 12" vinyl. All formats contained the Tango in the Night track "Mystified", and the CD and 12-inch included the bonus tracks "Say You Love Me" (from 1975; it had previously been included as a bonus track on the "Everywhere" CD single) and "Gypsy" (from the 1982 album Mirage).

The song was featured consistently throughout Fleetwood Mac's Tango in the Night and Behind the Mask concert tours, though it has not been played since 1990. When performed it featured added background vocals from band member Stevie Nicks as well as a heavier use of percussion and guitar in lieu of keyboards. It was rehearsed for the 1997 reunion tour The Dance, but was not performed. Its 1987 incarnation was filmed at Cow Palace, California, for the Tango in the Night live concert video, a performance that was later shown regularly on MTV.

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