Yu Xiaoguang (Chinese: 于晓光; born 16 May 1981), also known as Ethan Yu, is a Chinese composer and actor. Yu is a former swimmer and sprint canoer. In 2006 he has made a crossover from sports to films. Yu made appearances on many television series, most notably My Kung Fu Girlfriend (2006), Fighting in Peking (2009), Mao Anying (2010), The Happy Time of the Spicy and Hot Girlfriend (2012), City and Country Life (2014), and Namchow Mechanic Heroes (2015).
Yu was born in Dandong, Liaoning, on May 16, 1981. At the age of 7, he entered a sports school to learn to swim and later became a member of the Liaoning swimming team. In the National Youth Swimming Championships, he won the championship two years (1995 and 1996) in succession. In 1997, he started to learn to canoeing and won the championship in the National Canoeing Championships. After his early retirement, he was accepted to Central Academy of Drama, where he majored in acting. In 2002, he pursued advanced studies in Singapore, he studied music under Lee Wei Song.
In 2017, he married Korean actress Choo Ja-hyun and together they had a boy in 2018. He gained popularity in Korea through the tv show Same Bed Different Dreams 2.