Man-Kzin Wars
The Man-Kzin Wars is a series of military science fiction short story collections (and is the name of the first collection), as well as the eponymous conflicts between mankind and the Kzinti that they detail. They are set in Larry Niven's Known Space universe; however, Niven himself has only written a small number of the stories.
All of the cover art for the books in the series are drawn by Stephen Hickman.
Background
The first story set in the Man-Kzin Wars, The Warriors (1966), was one of Niven's earliest published stories and one of the first of what would become his Known Space series. Niven did not consider himself qualified to write war stories; therefore, although a number of his later stories referenced the Man-Kzin Wars, he never actually showed them. However, there was a large fan demand for stories covering the conflict, and a number of his author friends had shown interest in writing tales set in the timeframe. Niven therefore allowed the Man-Kzin Wars to become a shared universe, starting with the 1988 release of The Man-Kzin Wars.