"Boom" is a song and the first single from rapper Royce da 5'9"'s debut studio album Rock City which was released in 2002 through E1 Music (formerly "Koch Records) and Game Recordings after another record label had turned down his first version of the album. The single however was released on December 14, 1999, in CD and vinyl form. "Boom" was Royce's first single as a solo artist and was the source of him gaining underground notability as a rap artist.
The B-side of this single is "Soldier's Story". "Boom" was later sampled on the track "Crash", performed by West Coast rapper Schoolboy Q from his 2019 album Crash Talk.