Sayahnam is a 2000 Malayalam feature film that marks the directorial debut of R. Sarath with screenplay by himself. The film is a drama centred on the environmental and anti-nuclear issue in India. It stars O. Madhavan, Gomathi Mahadevan, Ebrahim Kutty, Alex Kadavil, Jomol and Remya Nambeesan. It won seven Kerala State Film Awards and two National Film Awards.
An old man K.K. Madhavan noted for his thinking and stance on social issues is proud of his scientist son Siddharthan but upset about the country's involvement in nuclear tests.