Otis Jackson Jr. (born October 24, 1973), known professionally as Madlib, is an American record producer, DJ, multi-instrumentalist, and rapper. Critically acclaimed for his eclectic and sample-heavy production style, he is regarded as one of the most influential producers in modern hip hop and alternative hip hop. His frequent collaborators include MF DOOM (as Madvillain), J Dilla (as Jaylib), Freddie Gibbs (as MadGibbs), Talib Kweli, and Erykah Badu.

Raised in Oxnard, California, Jackson began his career in music production in the early 1990s. He gained prominence as a member of the hip hop collective Lootpack and later formed the jazz-influenced group Yesterdays New Quintet. Jackson gained wider recognition for his collaboration with MF DOOM under the name Madvillain, producing the critically acclaimed album Madvillainy (2004). He was also credited for his work on "The Unseen" (2000) under his alter ego Quasimoto.

As a producer, Jackson has worked on numerous critically acclaimed projects. He produced the entirety of Freddie Gibbs' Piñata (2014) and Bandana (2019), both of which received widespread critical acclaim.

Madlib is the founder of the record label Madlib Invazion. His work often incorporates elements of jazz and world music.