Iyarkai (, transl. Nature) is a 2003 Indian Tamil-language romantic drama film directed by S. P. Jananathan in his directorial debut. The film stars Shaam and Radhika. Arun Vijay—who at the time was known as Arun Kumar—makes a cameo appearance and Bollywood actor Seema Biswas plays a supporting role. Iyarkai marks the debuts of Radhika and Biswas in Tamil cinema.

Based on a true story, the film revolves around a young woman who is unable to accept the love of a sailor because she is in love with a ship captain who was lost at sea. It was made on a budget of one crore (₹10,000,000). Vidyasagar composed the music for the film.

Iyarkai was released on 21 November 2003. Although the film was not successful at the box office, it won the National Film Award for Best Feature Film in Tamil at the 51st National Film Awards in 2004, and N. K. Ekambaram won the Tamil Nadu State Film Award for Best Cinematographer.