4U

4U or 4 U may refer to:

Music

 * 4U (album), by Elva Hsiao, 2002
 * 4U (Christina Milian EP), 2015
 * 4 U (Cody Simpson EP), 2010
 * 4U: Outside, an EP by BtoB, 2021
 * "4U", a song by Aero Chord, 2015
 * "4 U", a song by Korn from Issues, 1999
 * "4U", a song by Pi'erre Bourne from The Life of Pi'erre 5, 2021

Other uses

 * Germanwings (former IATA code: 4U), a former German low-cost airline subsidiary of Lufthansa
 * 4U, a rack unit size
 * 4U, the final (4th) catalog of Uhuru x-ray sources