Avargal (pronounced [aʋaɾɡaɭ] transl. They) is a 1977 Indian Tamil-language romantic drama film written and directed by K. Balachander. The film stars Sujatha, Kamal Haasan, Rajinikanth and Ravikumar. A triangular love story, it revolves around a woman who is caught between the man she fell in love with and her former sadistic husband who is supposedly reformed and wants to get back together with her.

Avargal was released on 25 February 1977. Although the film was a commercial failure, Sujatha won the Filmfare Award for Best Actress – Tamil, and the film qualified for the Indian Panorama. Balachander later remade the film in Telugu as Idi Katha Kaadu (1979), with Haasan reprising his role.

Anu is a dancer in love with Bharani, a flautist. After her father is transferred to Bombay, she slowly loses touch with Bharani, who does not respond to her letters. When her father falls ill, his colleague Ramanathan supports them. When Ramanathan offers to marry Anu, she is in a fix. She seeks time to decide and writes one last letter to Bharani, and upon receiving no reply, she marries Ramanathan. Soon after, her father dies.

After marriage, Ramanathan reveals his true personality; chauvinistic, sadistic, and possessive. Not wanting to be identified as a dancer's husband, he forces her to give up dancing. Ramanathan suspects Anu's character and expresses doubts regarding the paternity of their newborn son. Unable to take further abuse, and also for the well-being of her son, she divorces Ramanathan, refuses alimony, and returns to Madras to start a new independent life.

In Madras, Anu gets supportive friends at her office, particularly a widower named Janardhan "Johnny," who frequently "talks" through his puppet, Junior. As Anu struggles to find a house, he offers his own flat and moves to his outhouse. Despite loving Anu, he lacks the courage to tell her. Bharani, Johnny's neighbour, visits and is surprised to see Anu. She learns that none of her letters have reached Bharani, since they were intercepted by his mentally-ill sister. Bharani saw the letters only after his sister died. By then, it was too late, as Anu had already married Ramanathan. Heartbroken, Bharani remained single.

Ramanathan's estranged mother, Leelavathi, realises Anu is her daughter-in-law. She regrets her son's behaviour; exploiting her anonymity, she obtains work as Anu's maid. Anu renews her relationship with Bharani. Leelavathi also supports Anu's decisions and advises her to move ahead in life. They decide to marry and a date is fixed for a civil wedding.

Ramanathan comes to Madras as Anu's boss, seemingly repentant and wanting to redress his wrongs. He does not reveal that he is Anu's ex-husband to Bharani, who reveals his plans to marry Anu. Johnny learns about Anu and Bharani's love; though disappointed, he continues to support Anu. Leelavathi convinces Anu to discard her mangala sutra and marry Bharani. However, on the scheduled day, Anu falls ill and does not turn up at the marriage registrar's office. Bharani comes to her house, where he is disappointed to see Ramanathan taking care of Anu. Three men — Ramanathan, Bharani and Johnny — vy for her.

Ramanathan seeks forgiveness and expresses his desire to re-marry Anu. When Anu's colleague Rajathi, who knows Leelavathi, visits Anu, she is stunned to see Leelavathi employed as her maid. Despite Leelavathi's earlier pleas not to reveal her identity, Rajathi does so out of frustration. Shocked, Anu seeks Leelavathi's forgiveness. She goes to meet Johnny to seek his advice. Johnny finally courageously reveals his love for Anu through Junior. Anu expresses her inability to accept his love, but seeks his continued support as a friend. Noticing Anu's predicament and Ramanathan's continued involvement in her life, Bharani decides to move away from her and goes abroad for his musical programmes.