Kwak or KWAK may refer to:
- Kwak (surname), a Korean surname, 郭 (Guo/Kwok), 霍 (Huo/Quac) in Beijing, Middle Chinese
- KWAK (AM), a radio station (1240 AM) licensed to Stuttgart, Arkansas, United States
- KWAK-FM, a radio station (105.5 FM), licensed to Stuttgart, Arkansas, United States
- Pauwel Kwak, a Belgian beer