• Birthplace: Guri, South Korea
• Age: 27
• Height: 162
• Weight: 56
• Website: N/A

Park Ji-hyo (박지효) was born as Park Ji-soo (박지수) on February 1, 1997 in Guri, Gyeonggi-do, South Korea. She is the leader and main vocalist of the group TWICE.

When Jihyo was a third grader, she participated in a contest on Junior Naver for a child role. After she won second place, she was scouted by JYP Entertainment. She officially joined the company on July 15, 2005, and was a trainee for over 10 years. Jihyo was known mostly pre-debut as the face of Innisfree's teen line "TN" with boy band Boyfriend and later with future group mate Nayeon. She was set to debut in the girl group 6mix along with future group mate Nayeon, Jeongyeon and Sana and some ex-trainees, prior to competing on Sixteen, but the project was cancelled.