4 (officially stylized as № 4) is the fourth studio album by the American rock band Stone Temple Pilots, released on October 26, 1999, by Atlantic Records.

"[2] AllMusic critic Stephen Thomas Erlewine rated the album four out of five stars, praising the opening tracks "Down" and "Heaven & Hot Rods".

[15] Rolling Stone critic Lorraine Ali rated it three out of five, calling the songs "strong pop-rock pieces but without the self-consciousness of previous efforts".

[3] CMJ New Music Monthly critic M. Tye Comer called the album "powerful and cohesive", recommending readers to listen the tracks "Heaven & Hot Rods", "Church on Tuesday", "Sour Girl", and "No Way Out".

[19] The Power Lloyd CD Election Day had been released in 1998, and the cover was a white five-point star on a black field under the band's name; STP's No.

The album and its entire tracklisting is displayed in S1E7 of HBO's True Detective, during a scene in which Matthew McConaughey and Woody Harrelson's characters converse in a diner.