Yoo Da-in (born Ma Young-seon on February 9, 1984) is a South Korean actress.

She is best known for her performance in the indie film Re-encounter, her first leading role.

[2][3] In 2016, she played a supporting role in South Korean television series The Doctors.

[4] In June 2021, Yoo's agency announced that Yoo was planning to marry director Min Yong-geun and hold a private event with only family and close friends.

[5] On October 27, 2022, Yoo announced that she is pregnant with the couple's first child.