Thevar Magan (/ðeɪvər/ or /θeɪvər/ transl. Son of Thevar) is a 1992 Indian Tamil-language action drama film directed by Bharathan, and written and produced by Kamal Haasan. It stars Sivaji Ganesan, Haasan, Revathi, Gautami and Nassar; with Kallapart Natarajan, Kaka Radhakrishnan, Sangili Murugan and Vadivelu in supporting roles. The film's story involves a respected village chieftain's son who wants to open a business but his father wants him to help the villagers.

The script of Thevar Magan was completed in seven days; it was written using screenwriting software called Movie Magic. Haasan said The Godfather (1972) and the Kannada film Kaadu (1973) were inspirations for the film. P. C. Sreeram was the cinematographer and N. P. Satish edited the film, which was mostly made in Pollachi, with a few days' filming at Madras and Ooty.

Thevar Magan was released on 25 October 1992 – Diwali day; it received critical acclaim and completed a 175-day run at the box office. It was chosen as India's entry for the Best Foreign Language Film for the 65th Academy Awards but was not nominated. Thevar Magan won five National Film Awards, including Best Tamil Film, Best Supporting Actress for Revathi, and a Special Jury Award for Ganesan, which he declined. It was later remade in Hindi as Virasat (1997) and in Kannada as Thandege Thakka Maga (2006) and in Pakistani Punjabi as Jagger (2004)

Sakthivel returns home to his landlord father, Periyasamy Thevar's village in rural Madurai after completing his education in London. To his father's annoyance, he brings with him his westernised girlfriend Bhanumathi, hailing from Andhra Pradesh, to meet his family. Sakthi announces his plan to open a chain of restaurants in Madras and marry Banumathi, which saddens his father, as he wanted his son to help residents with his education. Periyasamy Thevar is a respected village chief whose younger half-brother, Chinnasamy Thevar, and nephew Mayan Thevar hold a grudge against him. Periyasamy's elder son, Muthuvel, though the oldest in his generation, is a drunkard. The entire village suffers from this long-standing family feud. Mayan always tries to outdo Periyasamy Thevar, as he believes Periyasamy to have poisoned Chinnasamy into paralysis.

Sakthi, despite reservations about the barbaric behavior persisting in the village, spends time there with Bhanu. They find an old temple, built by his great-grandfather, that has been closed off due to the feud between Periyasamy and Mayan over the first respect at the temple. Sakthi insists on entering with the help of his friend and servant, Isakki, who breaks open the temple. Mayan hears of this, and a riot erupts between the two village factions. To quell the situation, Periya Thevar contemplates apologizing to his opponents. Sakthi feels he or Isakki should apologize instead. Sakthi goes off to drop Bhanu at the station and, on his return, sees the riot. When Sakthi reaches home and asks for Isakki, he learns that Mayan's men have severed Isakki's left arm as punishment for opening the temple. To prevent further escalation, Sakthi, with his father's permission and with the help of his IAS friends in the government, legally opens the temple for all.

Slighted by this, Mayan hires goons to break a dam protecting a part of the village that supports Periya thevar. The goons use explosives to damage the dam, flooding half of the village and resulting in numerous deaths, including infants. This saddens Sakthi, who spots the goon who placed the explosives and gives chase. After capturing the goon, Sakthi hands him over to the police. The goon does not mention Mayan's involvement for fear of his own family's safety. Seeing the plight of the villagers, Sakthi changes his mind and decides to stay back with Periya Thevar. Weeks later, Mayan uses his clout to force a poor villager to close a portion of his land, preventing the public from easily reaching the main road. Sakthi and his father invite them for talks at the village panchayat to resolve the standoff.

In the panchayat, both sides repeatedly accuse the other. With no evidence, Mayan accuses Periya of orchestrating attacks on his brother's family and berates him. Disrespected and broken, Periya walks home and dies from a heart attack during sleep. Devastated and shocked about his father’s death and his disobedient behaviour, Sakthi takes over his father's duties as the village chieftain. The villagers express concern to Sakthi about having to daily circumnavigate the piece of land belonging to Mayan's side of the village, which causes a much longer travelling time. Sakthi reasons with the landowner Paramasivam to open it up for all villagers. Although understanding and willing, Paramasivam is Mayan's maternal uncle and is afraid of his nephew's backlash, especially because he has a daughter named Panchavarnam.

Sakthi assuages his fear by arranging the marriage between Panchavarnam and a Engineer from Madurai. Everybody involved happily agrees, and Paramasivam opens up the land. On the day of the wedding, however, the groom runs away, fearing Mayan. Paramasivam and Panchavarnam are distraught that if someone marries their daughter, they will live in constant fear. With her father's permission, Sakthi marries Panchavarnam, although he still has feelings for Bhanu. Mayan tries to counter Sakthi by getting Muthuvel drunk and obtaining his signature on ridiculous loan papers. The scheme is foiled in the last minute by Sakthi. Bhanu returns to meet Sakthi and learns about Sakthi's marriage. Although saddened, she understands the situation and leaves. Sakthi starts his new life with Panchavarnam. While Sakthi and Panchavaranam are returning from dropping off Banu at the station, a drive-by attempt is made on their life, which they narrowly escape. This brings them closer, and they start their marital intimacy.