- Clack can refer to numerous people: * Boyd Clack, Welsh writer, actor and musician. * Brenda Clack, politician. * Barbara Cooper Clack, world water skiing champion * Darryl Clack, player of American football for the Dallas Cowboys in 1986
* H. ...
- (Clacks) The technology depicted in Terry Pratchett's Discworld novels takes two forms: magical and mechanical. ...
- (clacks) a fictional series of semaphore towers in the Discworld novels