I Not Stupid (Chinese: 小孩不笨; pinyin: Xiǎohái Bù Bèn; lit. 'Children are not stupid') is a 2002 Singaporean comedy film about the lives, struggles and adventures of three Primary 6 pupils who are placed in the academically inferior EM3 stream. Written and directed by Jack Neo, and produced by Mediacorp Raintree Pictures, the film stars Huang Po Ju, Shawn Lee, Joshua Ang, Xiang Yun, Jack Neo, Richard Low and Selena Tan.

Released in cinemas on 9 February 2002, I Not Stupid earned over S$3.8 million, becoming the second-highest grossing Singaporean film. Its satirical take on the Singaporean education system and social attitudes in Singapore sparked public discussions and parliamentary debates that led to reforms in the education system. A sequel, I Not Stupid Too, was released in 2006. A third installment, I Not Stupid 3, is scheduled to be released in 2024.