Kelvin Yu (born 1979) is an American actor and writer. Yu's first film was the 2003 comedy The Utopian Society. He later made an uncredited appearance in the 2005 film Elizabethtown. The following year, Yu had a supporting role in the comedy Grandma's Boy. Yu played a role in the Ghost Whisperer episode "Double Exposure" (3x6) as Joseph. Yu had a supporting role in the 2008 Academy Award-winning biographical political drama Milk.

Yu has starred in several short films, including 2006's My Prince, My Angel. Yu later appeared with Linda Park on the ABC series Women's Murder Club, and a lead role in the 2007 short film Fortune Hunters. In 2020, he played a role in Wonder Woman 1984.