Jo Hyun-jae (Korean: 조현재; born May 9, 1980) is a South Korean actor. Jo made his entertainment debut as a singer in the four-member boy band Guardian, which disbanded after releasing their self-titled album in 1998. In 2000, after he drew popularity when he appeared in a commercial for sports drink Pocari Sweat, Jo began acting. He is best known for his leading roles in Love Letter (2003), Only You (2005), Ballad of Seodong (2005), and 49 Days (2011).

On March 18, 2018, Jo announced his plans of marriage to his non-celebrity girlfriend a retired professional golfer. The couple dated for three years and married on March 24, 2018. Their first child was born on November 20, 2018. On October 27, 2021, his wife gave birth to a second daughter.