Chinnanchiru Ulagam is a 1966 Indian Tamil-language comedy film written, produced and directed by K. S. Gopalakrishnan. The film stars Gemini Ganesan, K. R. Vijaya, Nagesh, Magic Radhika and V. K. Ramasamy. It is based on the Subbu Arumugam novel Manithanai Kaanom. Chinnanchiru Ulagam was released on 2 September 1966 and became a commercial success.

K. S. Gopalakrishnan was an Indian screenwriter, director, producer, and lyricist, who worked in Tamil, Malayalam and Hindi films. Since the early 1960s, he directed 70 films. He spent most of his career directing and producing movies with social and devotional themes. Most of his movies are melodramas. His son K. S. G. Venkatesh is an actor who has acted in television serials and in films like Sathuranga Vettai.