Sathyan (born Cheruvilakathu Veetil Manuel Sathyanesan Nadar; 9 November 1912 – 15 June 1971) was an Indian actor known for his work in Malayalam cinema. Known for his own style and versatility in acting, Satyan was one of the pioneers of realistic acting in Indian film industry. He is respectfully called Sathyan Master. He was also a soldier in the British Indian Army and later a police officer with the Travancore State Police.

Sathyan served as an officer in the British Indian Army during World War II. After the war he joined the Travancore state police as an inspector in late 1940s. During this time he got interested in acting and acted in amateur stage plays. He made his debut film in 1952 film Athmasakhi and rose to stardom with the critically acclaimed film Neelakuyil in 1954. He dominated the Malayalam film industry over two decades ( 1952 – 1971) along with his contemporary Prem Nazir.

He is remembered for his performances in Anubhavangal Palichakal (1971), Karinizhal (1971), Kadalpalam (1969), Yakshi (1968), Odayilninnu (1965), Udhyogastha (1967), Veettu Mrugam (1969), Vazhvemayam (1970), Oru Penninte Kadha (1971), Karakanakadal (1971), Pakalkinavu (1966), Ningalenne Communist Akki (1970), Kayamkulam Kochunni (1966), Sarasayya (1971), Rowdy (1966), Mooladhanam (1969),Chemmeen (1965), Ammayenna Sthree (1970), Kuttavali (1970), Crossbelt (1970), Adimakal (1969), Thacholi Othenan (1964), Aadyakiranangal (1964) and Mudiyanaya Puthran (1961).

Sathyan won the Best Actor Award at the inaugural Kerala State Film Award ceremony for his double role in Kadalpalam. He won the Kerala State Film Award for Best Actor again in 1971 for his film Karakanakadal.

Sathyan was born in Aramada, Thiruvananthapuram on 9 November 1912. His parents' names were Manuel and Emily. The eldest of five sons, his younger brothers were Chellayya, Neshan, Devadas, and Jacob. His family were Nadar Christians who belonged to the Anglican Church (C.I.B.C.) (later Church of South India (C.S.I.). Their family home in Aramada was called Cheruvilakathu Veettil.

Sathyan passed the Vidwan exam, equivalent to Master of Arts before joining St. Joseph's Higher Secondary School, Trivandrum as a teacher. After some time, he got job as a clerk in the Kerala Secretariat and worked there for about a year. He joined the army in 1941 and got posted as a Commissioned Officer of the Viceroy of India. He served the British army in Manipur, Burma (now Myanmar) and British Malaya (now Malaysia) during the World War II period. After finishing his term in the army, he returned home and joined the then Travancore State Police as a police inspector. During the Punnapra-Vayalar uprising in 1946, Sathyan was the inspector at Alappuzha North Police Station.

Sathyan was married to Jessy until his death in 1971. They have three sons: Prakash, Satheesh and Jeevan.

Sathyan's entry into the field of acting started during his tenure as the police officer. At that time he acted in several amateur plays and that experience made him more interested in acting. His entry to film industry was accidental. He got introduced to a film musician Sebastian Kunjukunju Bhagavathar during his tenure as Inspector in Alappuzha North Police Station. The musician introduced Sathyan to various film personalities and one producer promised to cast him in a film; however, Sathyan did not get any calls from the producer. Sathyan came to know about a film that Kaumudi Chief Editor and his neighbour K. Balakrishnan were planning. He met Balakrishnan and the latter was impressed by Sathyan. Balakrishnan cast him as the protagonist in the film written and produced by him, titled Thyagaseema. The then Deputy Superintendent of Police, Mary Arputham, objected to Sathyan acting in the film. Sathyan resigned from his job to act in this film and shortened his name to Sathyan from Sathyaneshan. However, the film was dropped. Thyagaseema was also incidentally the first film for Prem Nazir.