Andy On (Chinese: 安志杰; pinyin: Ān Zhìjié; Jyutping: on1 zi3 git6; Cantonese Yale: ōn ji giht) (born May 11, 1977) is an American actor and martial artist.

Like fellow Hong Kong film star Nicholas Tse, On trained in martial arts under Chung Chi Li, the leader of the Jackie Chan Stunt Team.

On began training with Chan in 2001 for the film Looking for Mister Perfect/Kei fung dik sau (2003), which was released two years later.

He has released some t racks, including a duet with Taiwanese pop singer Jolin Tsai called "Angel of Love".

He continues to train in Wing Chun Kung Fu with good friend, actor, and martial artist Philip Ng, and has studied Thai boxing under former world kickboxing champion and actor Billy Chau in preparation for Star Runner.

During production of the film Three Kingdoms: Resurrection of the Dragon (2008), On was hit in the face by a stuntman during an action sequence.