Wen Tzu-yun (, born 29 September 1993) is a Taiwanese karateka. At the 2020 Summer Olympics in Tokyo, Japan, she won one of the bronze medals in the women's 55kg event. Wen is also a two-time gold medalist in the women's kumite 55kg event at the Asian Games and a two-time bronze medalist in this event at the World Karate Championships.
Wen won the gold medal in the women's 55kg event at the Asian Games both in 2014 and in 2018. She won one of the bronze medals in her event at the 2016 World University Karate Championships held in Braga, Portugal. She also won the silver medal in the women's team kumite event.
At the 2017 World Games held in Wrocà Âaw, Poland, Wen won the silver medal in the women's kumite 55kg event. In the final, she lost against Valéria Kumizaki of Brazil.
Wen represented Chinese Taipei at the 2020 Summer Olympics in Tokyo, Japan in karate. She won one of the bronze medals in the women's 55kg event. In her semifinal, she lost against eventual silver medalist Anzhelika Terliuga of Ukraine. In November 2021, Wen competed in the women's 55kg event at the World Karate Championships held in Dubai, United Arab Emirates.