"Not Now" is a song by American rock band Blink-182, released on November 28, 2005, as the lead single from the group's first compilation album, Greatest Hits (2005). The song was composed and recorded during the sessions that produced Blink-182 (2003).

"Not Now" was released to radio on October 18, 2005. The song reached number 18 on Billboard's Hot Modern Rock Tracks chart and number 30 on the UK Singles Chart.

The song concerns death and miscommunication. The song's guitar riffs were compared to the Descendents by journalist Joe Shooman, and are interspersed by verses containing a church organ.

"Not Now" was first released for download on the iTunes Music Store on the day of the album's release. It was included as a bonus track on the UK edition of Blink-182, although it is unclear why it was originally left off the track listing of the international edition. The song was also included on Atticus: ...Dragging the Lake, Vol. 3 (2005), a compilation album released by DeLonge's clothing company, Atticus Clothing. Both of these physical releases are a slightly shorter edit, where the bridge is shortened, making it roughly 15 seconds shorter.

When the song was selected to be a single for the band's post-breakup Greatest Hits album, it ran into trouble with the trio's management, which were split between DeLonge (who remained with original Blink manager Rick DeVoe) and Hoppus/Barker (who switched to Irving Azoff to handle their new project, +44). The Azoff camp lobbied for the Hoppus-led "Another Girl, Another Planet" as the lead single, while DeVoe argued for "Not Now", which eventually won.

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