Holy Warrior is the second novel of the eight-part Outlaw Chronicles series by British writer of historical fiction, Angus Donald, released on 22 July 2010 through Little, Brown and Company.

This novel continues the story of Alan Dale, based on the historical Alan-a-Dale; warrior and troubadour in Robin Hoods band of outlaws.

The novel takes place during the Third Crusade, an attempt by European leaders to reconquer the Holy Land from Saladin.

In the novel Robin is forced to join Richard the Lionheart on his crusade and during which learns he is the target of an assassination attempt; Alan is tasked with discovering the origins of the attack.

George Williams of The Australian wrote that Donald's approach to dealing with the complex issues such as religious hatred and the general intolerance of the time "marks it as a cut above other versions of the legend" and stated that, "like Outlaw, Holy Warrior is undoubtedly one of the finest Robin Hood stories of recent times.".