Sadagopan (better known as Chitralaya Gopu) is an Indian screenwriter and director who works in the Tamil cinema. He has written nearly 60 films, and directed 27 of them.^[2] He scripted dramatic films such as Moondru Dheivangal and Shanti Nilayam and comedies such as Kadhalikka Neramillai, Galatta Kalyanam, Patti Sollai Thattathe and Uttharavindri Ulle Vaa.^[3]

C. V. Sridhar and Sadagopan were childhood friends since their schooldays in St. Joseph's High School, Chengalpattu.^[4] Both were playwrights; Sridhar wrote stage plays and played the hero while Sadagopan wrote the humorous parts and played the comedian.^[5] Later, when Sridhar had the opportunity to direct a film, he asked Sadagopan to join him and produce the comedy track.^[6][7] The film Kalyana Parisu (1959) was a hit and Sridhar started his own production house, Chitralaya.^[4][8] Sadagopan became popularly known as 'Chitralaya' Gopu.^[9]

He received the Kalaimamani Award from Chief Minister, Jayalalithaa in 1992.^{[citation needed]}

He directed and acted in television forays, such as Washingtonil Thirumanam, which was shot in the U.S.^{[citation needed]}

Gopu is married to Kamala, a novelist.^[5] They have four sons.^[10][11]