Wiwek (born Wiwek Mahabali), also known by the pseudonym Oui'Wack, is a Dutch DJ and music producer from Utrecht, which is located in the Netherlands. Gregor Salto suggested that he use his given name as his stage name.

Wiwek is best known as the pioneer of "jungle terror", a hybrid style of dance music characterized by offbeat kick drums, dissonant lead synths, and tribal drum and chant samples. His music has been released on such labels as Barong Family and OWSLA, and led to collaborations with Skrillex and Yellow Claw. He is also the label head of his own jungle terror-based label Rimbu Recordings.

Most recently, Wiwek's The Free and Rebellious EP was used as the soundtrack and score to the short film Still in the Cage, written and directed by Jonathan Desbiens and produced by Wiwek and Skrillex.