Gwei Lun-mei (; born 25 December 1983) is a Taiwanese actress. She started her acting career in 2002, with the film Blue Gate Crossing. Gwei then appeared in a few more films before achieving wide recognition for the film Secret (2007), directed by Jay Chou, in which Gwei played the character of Lu Hsiao-yu.
In 2012, Gwei starred in Girlfriend, Boyfriend, a coming-of-age drama in which three teenagers navigate their attraction to one another â from their high school years into their adulthood. The film won Gwei a Best Leading Actress award at the 49th Golden Horse Awards.
Gwei has been in a long-term relationship with actor and filmmaker Leon Dai since 2004.