Chauncey Alexander Hollis Jr. (born May 21, 1987), known professionally as Hit-Boy, is an American record producer, rapper, singer, and songwriter from Fontana, California. He first signed with fellow producer Polow da Don in 2007 as in-house production staff for his label Zone 4, and later signed with Kanye West's GOOD Music in 2011 to serve a similar role. He first gained major recognition for his work on Lil Wayne's 2009 single "Drop the World", which entered the Billboard Hot 100 at number 18. The following year, he produced West and Jay-Z's 2011 single "Niggas in Paris", which peaked at number five on the chart and received diamond certification by the Recording Industry Association of America (RIAA).

Throughout the remaining decade, he received credits on the Billboard Hot 100-top 50 singles "Trophies" by Drake, "Clique" by GOOD Music, "Sorry" by Beyoncé, and his first to peak the chart: "Sicko Mode" by Travis Scott, among other commercially successful productions. He pursued a career as a recording artist while doing so, and signed with Interscope Records to release his debut studio album, We the Plug (2013) in collaboration with his HS87 collective. He guest appeared alongside Roddy Ricch on Nipsey Hussle's 2019 single "Racks in the Middle", which won Best Rap Performance at the 62nd Annual Grammy Awards. He has also released the collaborative extended play What You Expect (2021) with Michigan rapper Big Sean, helmed the entirety of the production of six albums by Nas—King's Disease (2020), King's Disease II (2021), Magic, King's Disease III (2022), Magic 2 and Magic 3 (2023)—as well as the album Burden of Proof (2020) by Benny the Butcher, each of which entered the Billboard 200.

His record label, Hits Since '87 was founded in 2011 also as an imprint of Interscope.