Punnagai
| Punnagai | |
|---|---|
Theatrical release poster  | |
| Directed by | K. Balachander | 
| Screenplay by | K. Balachander | 
| Based on | Satyakam by Narayan Sanyal  | 
| Produced by | R. Venkatraman  K. Arumugam H. Nagaraja Rao S. S. Nachammai  | 
| Starring | Gemini Ganesan R. Muthuraman Nagesh M. R. R. Vasu Jayanthi  | 
| Cinematography | N. Balakrishnan | 
| Edited by | N. R. Kittu | 
| Music by | M. S. Viswanathan | 
Production company  | Amutham Pictures  | 
Release date  | 
  | 
Running time  | 154 minutes | 
| Country | India | 
| Language | Tamil | 
Punnagai (transl. Smile) is a 1971 Indian Tamil-language buddy drama film directed and written by K. Balachander. It is a remake of the Hindi film Satyakam (1969). The film stars Gemini Ganesan, R. Muthuraman, Nagesh, M. R. R. Vasu and Jayanthi. It was released on 5 November 1971.