"Again" is a song by American singer Janet Jackson from her fifth studio album, janet.(1993). Written and produced by Jackson, James Harris III, and Terry Lewis, the ballad was released as the album's third single in October 1993. "Again" topped the U.S. Hot 100 in late 1993 and received a nomination for the Academy Award for Best Original Song.

Based on a lost love, "Again" was included as the closing song to her 1993 box-office film debut in Poetic Justice. While not included on its soundtrack album, the song was nominated for Best Original Song at the 66th Academy Awards, where Jackson performed the song live. The janet.jazz-funky track "Funky Big Band" appears on the single as a B-side. A French version of the song was also recorded by Jackson and appears on the CD single as well as the limited edition of the janet.album. The track became her seventh number one on the Hot 100 chart, staying atop for two weeks.

Jackson has performed the song on all of her tours, including the janet. Tour, The Velvet Rope Tour, All for You Tour, and Rock Witchu Tour.

"Again" is set in common time with a key of C major. Jackson's vocal chords ranges between the tonal nodes of high-tone G ₃to low-tone D ₅. The song is in a moderate tempo of 64 beats per minute with the chord progression being set like C–Am–C–G/F–G in the first verse and C–Em–Am–G/F in the chorus.

The music video for the song was directed by Jackson's then-husband René Elizondo, Jr. It features actor Gary Dourdan as Jackson's lost love, with Jackson writing in her diary as she reminisces about her love through flashbacks. The alternate version of the video contains scenes from Poetic Justiceplaying on a television. The original video appears on the 1994 compilation janet.and the 2004 DVD From janet. to Damita Jo: The Videos, while the Poetic Justiceversion is included on the 2001 DVD edition of All for You.

The song was sampled by Iyaz on his 2010 single, "Solo."