Viik is a surname of both Finnish and Estonian origin. Viik may refer to:
Jaan Viik, Estonian Holocaust perpetrator Linnar Viik (born 1965). Estonian information technology scientist and entrepreneur Tommi Viik (born 1987), Finnish footballer Tõnu Viik (astronomer) (born 1939), Estonian astronomer Tõnu Viik (philosopher) (born 1968), Estonian philosopher