Duetto () is a South Korean classical crossover duo consisting of Baek In-tae and Yoo Seul-gi, formed in 2017 by Starship Entertainment in Seoul. They released a self-titled EP on May 17, 2017, and two singles, "Dream" and "Reminisce", in 2018. They are both classically trained tenors who studied together at Hanyang University under baritone .
Baek and Yoo were lead members of the boy band InGiHyunSang, the first runner-up in season one of the crossover audition program Phantom Singer.