The Stool Pigeon (simplified Chinese: 线人; traditional Chinese: 綫人; pinyin: Xiàn Rén; Jyutping: Sin3 Jan4) is a 2010 Hong Kong-Chinese action thriller film directed by Dante Lam and starring Nicholas Tse, Nick Cheung and Gwei Lun-mei. The film is about police detective, Don Lee (Cheung), who uses informants to gain information about gangsters. Lee begins to feel guilty when his informants are caught, but sends out a street racer named Ghost (Tse) as an informant to gain information about a gangster name Barbarian (Lu Yi).

The film was released in China on August 24 and two days later in Hong Kong. The film performed well in the Hong Kong box office, though it has received mixed reviews.