Ryu Sang-gu (Korean: 류상구; born 1984), known by the stage name Deepflow (딥플로우) is a South Korean rapper, music producer, and CEO of the hip hop record label Vismajor Company. He won the award for Musician of the Year at the 2016 Korean Music Awards.

In February 2021, Deepflow announced his plans to marry a non-celebrity. Due to the coronavirus pandemic, the wedding was postponed to December 2021.