Jay Chou Chieh-lun (traditional Chinese: 周杰倫; simplified Chinese: 周杰伦; pinyin: Zhōu Jiélún; born 18 January 1979) is a Taiwanese singer-songwriter, actor, director, and businessman. Regarded as one of the most successful and influential singers in the Chinese-speaking world, he is often referred to as the King of Mandopop. Chou's works, which often blend Eastern and Western styles, has been recognized for its impact on fashion and musical trends in the Greater China region.

In 2000, Chou released his debut studio album Jay to runaway success, solidified by his second album Fantasy (2001). Common Jasmine Orange (2004) was recognized by Guinness World Records as the best-selling physical album in China in the 21st century, having sold over 2.6 million copies. He has won over 15 Golden Melody Awards—the most by any singer in the ceremony's history. He served as a judge on The Voice of China for four seasons from 2016 to 2020. Chou became the first Mandopop artist to top IFPI’s Global Album Sales Chart, with his Greatest Works of Art (2022) being the world’s best-selling record in 2022.

In the non-Chinese-speaking world, Chou is perhaps better known for his work beyond music. He made his acting debut in the film Initial D (2005), followed by roles in Zhang Yimou's epic Curse of the Golden Flower (2006), Kevin Chu's Kung Fu Dunk (2008) and The Treasure Hunter (2009), Hollywood films The Green Hornet (2011) and Now You See Me 2 (2016). He directed and starred in films Secret (2007), The Rooftop (2013) and TV series Pandamen (2010). He hosted the CTI talkshow Mr. J Channel (2010–2011) and the Netflix reality show J-Style Trip starting in 2020. As a businessman, Chou has been the President of his own fashion brand, PHANTACi, since 2006 and is a founding member of the talent agency JVR Music, established in 2007.