Tiger JK (born June 11, 1974; as Seo Jung-kwon Hangul: 서정권, Hanja: 徐廷權)) is a Korean-American rapper, best known as one of the founding members of hip hop group Drunken Tiger. He is the founder and former CEO of Jungle Entertainment an imprint distributed by CJ E&M. JK and Drunken Tiger are also noted collaborators of various South Korean hip hop artists, and are the basis of the South Korean hip hop joint movement known as simply "Movement" or "The Movement".

He has released nine studio albums under Drunken Tiger, and continues to collaborate with that said group today. In addition to his musical career he has most recently started entrepreneurship releasing his own brand of "Beats", headphones titled "Tigerbeats", and has even started his own clothing brand.