Valentín Oliva (born 23 January 1998), professionally known as Wos (stylized in all caps), is an Argentine singer, actor, and freestyler.

Starting as a freestyler, he won the Argentine competition of freestyle battle El Quinto Escalón on several occasions, achieving national recognition. He also won the FMS Argentina and the international tournament Red Bull Batalla de Gallos, both in 2018.

Following his success in freestyle battles, he decided to pursue a musical career. In 2018, he released his first single "Púrpura" while in 2019 he released his debut studio album Caravana. He has won several Gardel Awards and received a nomination for Best New Artist at the 21st Annual Latin Grammy Awards in 2020.