Rule 3:36 is the second studio album by American rapper Ja Rule. It was released on October 3, 2000, by The Island Def Jam Music Group, Def Jam Recordings and Irv Gotti's Murder Inc. Records. The album features guest appearances from Christina Milian, Lil' Mo, Shade Sheist and Jayo Felony, with producers Irv Gotti (who also executive produced the album), Ty Fyffe, Tru Stylze, Lil' Rob and Damizza contributing to the album. The album marked a significant change in Ja Rule's musical style, shifting from hardcore hip hop to a more radio-friendly pop rap oriented sound to greater success.

This album contained singles such as "Thug Lovin'" (featuring Bobby Brown), "Mesmerize" (featuring Ashanti) and "The Pledge (Remix)" (by Ashanti featuring Nas, Ja Rule and 2Pac). "Murder Reigns" was also released as a single titled "Reign" in select territories outside of North America, such as Europe and Australasia.