This article is about the military strategist Sun Tzu. For the mathematician of the same name, see Sun Tzu (mathematician).

Sun Tzu (544 BC – 496 BC) also called Sun Wu, was an ancient Chinese general, military expert and philosopher. He is widely believed to have been the author of the most important work of military strategy and theory, The Art of War. His name means 'Master Sun'. His family name is Sun, Tzu is an honorific (title of respect) meaning 'master'.

Most of what we know about Sun Tzu comes from Ssu-ma Ch'ien's Shih chi, also called the Records of the Grand Historian. According to the Grand Historian, Sun Tzu lived during the period called 'The Spring and Autumn Period of China'. This era dates from 770 BC to 476 BC.