Nalla Naal (transl. Good day) is a 1984 Indian Tamil-language masala film directed by R. Thyagarajan and produced by Thevar Films. The film stars Vijayakanth and Thiagarajan. It was released on 1 June 1984.^[1]

This article needs an improved plot summary. (March 2023)

The film tells in a flashback that the father of Chinna Durai is assassinated by the father of Kaali. Chinna Durai takes revenge, kills him and goes to prison leaving his mother and sister to see him leave.

Furious, Kaali promises to kill Chinna Durai on her way out. However, Kaali meets Chinna Durai's sister, Shenbagam. She wraps her heart to marry him knowing the story, that he is looking for Chinna Durai, who is his brother protecting him from murder.

Under the name of Muthu, he gets out of prison and goes to the village to meet his sister. In shock, Muthu did not know she was married to Kaali. Muthu and Kaali become friends under the pretext of another name. Knowing the release date of Chinna Durai, Kaali does not find him in jail. He has a doubt and tries to find him. The ending tells how Chinna Durai and Kaali will associate.

The music was composed by Ilaiyaraaja, with lyrics by Vaali.^[2]

Jayamanmadhan of Kalki wrote the film had listenable three songs, enjoyable item number, slightly funny humour, watchable two fights and use of horses, questioning if that was enough.^[3]