Leslie Kwok Ying Wah (born 12 November 1973) is a Singaporean former swimmer, who specialized in sprint freestyle events and later turned into an actor, entrepreneur, and a part-time professional model.

Kwok is also an Anglo-Chinese School alumnus, and later a graduate with a bachelor of science degree in civil and structural engineering at Nanyang Technological University.

Diving in with a 0.73-second deficit, Kwok scorched the entire race to share a fourth seed with Peru's Luis López Hartinger in an exact time of 24.00, but finished outside an entry standard.

[5][6] At the 2005 Southeast Asian Games in Manila, Kwok added a third bronze to his six-year-old hardware in the 50 m freestyle (23.58), finishing behind Indonesia's veteran Richard Sam Bera and Thailand's newcomer Arwut Chinnapasaen by more than half a second (0.50).

In early 2006, Kwok announced his official retirement from swimming to extend his resume in entrepreneurship and other lifestyle businesses.