Detective Harry Callahan is a fictional character from the Dirty Harry film series, portrayed by actor Clint Eastwood. He is known for his tough, no-nonsense approach to law enforcement and his willingness to bend the rules to achieve justice. Callahan often uses his signature .44 Magnum revolver, which has become an iconic symbol of his character. Set in San Francisco, the films showcase Callahan's battles against crime and his interactions with various criminals and law enforcement officials. His character embodies themes of vigilante justice and moral ambiguity, making him a memorable figure in the action and crime genres.