Diesel is a 2025 Indian Tamil-language action thriller film written and directed by Shanmugam Muthusamy in his directorial debut and produced by Third Eye Entertainment and SP Cinemas. The film stars Harish Kalyan, Athulya Ravi and Vinay Rai in the lead roles with Vivek Prasanna as the antagonist with an ensemble cast consisting of P. Sai Kumar, Ananya, Karunas, Ramesh Thilak, Kaali Venkat, Sachin Khedekar, Zakir Hussain, Thangadurai, and KPY Dheena in pivotal roles.