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.

Ryan Daniel Montgomery, known professionally as Royce da 5'9", is an American rapper. Best known for his association with fellow Detroit rapper Eminem, they became acquainted in 1997 and formed the hip hop duo, Bad Meets Evil the following year. Their 2011 single, "Lighters" peaked at number four on the Billboard Hot 100 and preceded the release of their debut extended play (EP), Hell: The Sequel (2011). The song and its parent EP, which debuted atop the Billboard 200, have yielded Montgomery's furthest commercial success.