Nadunisi Naaygal (transl. Midnight Dogs) is a 2011 Tamil-language experimental psychological thriller film written and directed by Gautham Vasudev Menon and produced by Photon Kathaas Productions and R. S. Infotainment. The film stars Veera, Sameera Reddy, and Deva, with Swapna Abraham and Ashwin (in his debut) in other pivotal roles. The film notably has no score, instead featuring sounds designed by Renganaath Ravee. Cinematography and editing were handled by Manoj Paramahamsa and Anthony Gonsalves, respectively. The film released on 18 February 2011, simultaneously dubbed and released in Telugu as Erra Gulabilu.

The film's title is taken from the title of a poem of Sundara Ramasamy.