Jeong Seok-yong (정석용) is a South Korean character actor born on December 31, 1970. Beginning his performing career in stage theater during the late 1990s, he transitioned into screen acting and established a prolific career across film and television.

Jeong's feature film credits include notable appearances in King and the Clown (2005), Like a Virgin (2006), Sunny (2011), Train to Busan (2016), and Seven Years of Night (2018). On television, he has featured in major drama series including Six Flying Dragons (2015–2016), Arthdal Chronicles (2019), D.P. (2021), Work Later, Drink Now (2021), and Tale of the Nine Tailed 1938 (2023).