Si Tjonat (Perfected Spelling: Si Conat) is a likely-lost 1929 bandit film from the Dutch East Indies (now Indonesia) directed by Nelson Wong and produced by Wong and Jo Eng Sek. Based on the novel by F.D.J. Pangemanann, the silent film followed an indigenous man who, having killed his fellow villager, flees to Batavia (today Jakarta) and becomes a bandit. After kidnapping an ethnic Chinese woman, he is defeated and brought to justice.
A commercially oriented work aimed at ethnic Chinese audiences, Si Tjonat received mixed reviews; box office proceeds are unclear. Although intended as a serial, no sequel was ever made; the production house, Batavia Motion Picture, closed soon afterwards. However, several works in the same genre as this one were released soon afterwards, including Si Pitoeng, which used the same director and star.