Yuju (유주) also known as Choi Yu-na (최유나) is a South Korean singer. She is the main vocalist of GFriend, which is under Source Music. She made her debut as a member of the girl group GFriend in 2015. Apart from the group, she has been a featured vocalist on songs by artists like Sunyoul and The Name.

She was born in Ilsan, South Korea and has one older sister. She trained at LOEN Entertainment. She attended the Seoul School of Performing Arts and graduated in February 2016 along with Eunha.

Before fame, Yuju was a contestant on the first season of K-pop Star 1 but was eliminated in the first round.