Louis Koo (Koo Tin-lok 古天樂; born 21 October 1970) is a Hong Kong film actor. He began his professional career as an actor in local television series, winning TVB's Best Actor award in 1999 and 2001. For the past decade, he has focused primarily on his film career. Koo has become one of the stalwarts of the Hong Kong film industry, and is a popular spokesman for various brands including Pepsi, Osim, Tag Heuer, Lotte, Zero Eyewear, Lay's, and Samsung Galaxy.

Koo is the highest earning actor in Hong Kong with 236 million HKD (30.4 million USD) in 2013, 2014 with 300 million HKD (38.6 million USD) and 2015 with 400 million HKD (51.8 million USD).

Koo left school after completing his secondary education. He worked in a modelling agency before he was approached to model for advertisements and karaoke videos. He then signed as a contract artist with TVB in 1993. During the period when he was under contract with TVB, he starred in many television dramas, movies and commercials. Koo started gaining recognition in 1995 with his leading role in The Condor Heroes 95, a popular series based on a classic wuxia novel. In 1997, Koo began sporting an extreme tan (for which he is well known for), which apparently enabled him to take on more contemporary roles. He also began taking on roles in films such as the paranormal Troublesome Night series, romantic film Sealed with a Kiss as well as action films such as The Suspect. In 1999, Koo received TVB's Most Popular Male Artist Award for Detective Investigation Files IV. In 2001, Koo was given the award once again for A Step into the Past and also the Most Stylish Personality Award and Men of Power 2001. He then went on an indefinite hiatus from television and has since focused on his film career.

Koo is known for many of his TVB television dramas, most notably The Condor Heroes 95 (1995); Detective Investigation Files IV (1999); At the Threshold of an Era ll (2000) and A Step into the Past (2001). Due to the popularity of TVB dramas in the late 1990s, Koo amassed a sizeable fan base in Hong Kong, Taiwan, China, South-east Asia and North America. While he had often been cast in cool, aloof characters, he took a different approach to his role in A Step Into the Past. This deviation from his usual aloof on-screen persona to a funnier, carefree and down-to-earth one resonated with the audience and widened his acting range, leading to many offers to star in romantic comedies. He began acting in a number of romantic comedies immediately after his departure from TVB, opposite actresses such as Gigi Leung, Cecilia Cheung, Sammi Cheng and Miriam Yeung.

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