The Secret History of the Mongols (Traditional Mongolian: Mongγol-un niγuča tobčiyan, Khalkha Mongolian: Монголын нууц товчоо, Mongolyn nuuts tovchoo) is the oldest surviving Mongolian-language literary work. It was written for the Mongol royal family some time after Genghis Khan's death in AD 1227, by an anonymous author and probably originally in the Mongolian script, though the surviving texts all derive from transcriptions or translations into Chinese characters dating from the end of the 14th century, compiled by the Ming dynasty under the name The Secret History of the Yuan Dynasty (Chinese: 元朝秘史; pinyin: Yuáncháo mìshǐ). Also known as Tobchiyan (Chinese: 脫必赤顏 or 脫卜赤顏; pinyin: Tūobìchìyán, Tūobochìyán) in the History of Yuan.
The Secret History is regarded as the single most significant native Mongolian account of Genghis Khan. Linguistically, it provides the richest source of pre-classical Mongolian and Middle Mongolian. The Secret History is regarded as a piece of classic literature in both Mongolia and the rest of the world.