Donnie Yen Chi-tan (Chinese: 甄子丹; Jyutping: jan1 zi2 daan1; pinyin: Zhēn Zǐdān; born 27 July 1963) is a Hong Kong actor, filmmaker, martial artist, and action director. His accolades include three Golden Horse Awards and five Hong Kong Film Awards. He is best known for portraying Wing Chun grandmaster Ip Man in the Ip Man film series, namely Ip Man (2008), Ip Man 2 (2010), Ip Man 3 (2015), and Ip Man 4: The Finale (2019). He also served as a co-producer of the spin-off Master Z: Ip Man Legacy (2018).

Born in Guangdong, Yen developed an interest in martial arts at a young age and began experimenting with various styles, including tai chi and other traditional Chinese martial arts. At age 18, he auditioned for action choreographer Yuen Woo-ping in Hong Kong. He landed his first starring role in the 1984 Hong Kong martial arts action film  Drunken Tai Chi. He made his breakthrough role as the antagonist General Nap-lan in Once Upon a Time in China II (1992), opposite Jet Li's character. He appeared in several other Hong Kong kung fu films, including Iron Monkey (1993) and Wing Chun (1994). In 1997, he starred in his directorial debut film, Legend of the Wolf.