Book of Ryan is the seventh studio album by American rapper Royce da 5'9". It was released on May 4, 2018 by Royce's own label Heaven Studios and eOne Music. The album features guest appearances from artists Eminem, J. Cole, Pusha T, Jadakiss, Fabolous, T-Pain, Logic, pianist Robert Glasper, Chavis Chandler, Agent Sasco, King Green, Ashley Sorrell, Melanie Rutherford, and Marsha Ambrosius. Meanwhile, the production was handled by a wide array of producers, including Mr. Porter, S1, Boi-1da, Cool & Dre, DJ Khalil and Frank Dukes, among others. Upon its release, the album received critical acclaim.

Jeffrey E. Campbell, better known as Agent Sasco, and Assassin, is a Jamaican dancehall deejay.