Kwak or KWAK may refer to:
Radio Callsigns KWAK (AM), a radio station (1240 AM) licensed to serve Stuttgart, Arkansas, United States KWAK-FM, a radio station (105.5 FM), licensed to serve Stuttgart, Arkansas KWAK-LP, a low-power radio station (102.5 FM) licensed to serve San Xavier, Arizona, United States
Surnames James Kwak, an American law professor Geesje Kwak, a Dutch art model Nang Kwak, a Thai Bodhisattva Pauwel Kwak, a Belgian ale named after an 18th-century innkeeper and brewer Alfred J. Kwak, a cartoon television series Kwak (surname), a Korean surname (郭, 霍) alternatively spelled Gwak
Other Kwak, an alternative spelling of couac, a manioc flour. Kwak (store), a store in San Francisco that only sells rubber ducks
See also Guo, a Chinese surname (郭) alternatively Romanized as Kwok Quack (disambiguation)