Mo Money Mo Problems

"Mo Money Mo Problems" is a song by American rapper The Notorious B.I.G., released through Bad Boy Records and Arista Records, which impacted US mainstream radio stations on July 15, 1997, as the second single from his second and final studio album, Life After Death (1997). It was written by Christopher Wallace, Steven Jordan, Mason Betha, and Sean Combs, while the latter also produced the song. It contains a sample and an interpolation of "I'm Coming Out" by Diana Ross, for which Bernard Edwards and Nile Rodgers are also credited as songwriters. The song features guest vocals from Mase and Sean "Puff Daddy" Combs, and featured an uncredited hook sung by Kelly Price.

Released posthumously, "Mo Money Mo Problems" topped the Billboard Hot 100 for two weeks in 1997, replacing "I'll Be Missing You" at the top of the chart, Puff Daddy's own tribute to the rapper. The song is Notorious B.I.G.'s second posthumous number-one single, following "Hypnotize", making him the only artist in Hot 100 history to have two number-one singles posthumously. It was the sixth song to hit number one posthumously for a credited artist. It received a nomination for the Grammy Award for Best Rap Performance by a Duo or Group in 1998.

Based on airplay and chart success, the song is considered one of the most popular singles in hip hop history. In 2021, Samoan Australian hip hop group No Money Enterprise covered the song on Australian youth broadcaster Triple J's Like a Version segment.