Sethu () is a 1999 Indian Tamil-language romantic tragedy film, written and directed by Bala in his debut. The film stars Vikram and Abitha. The score and soundtrack were composed by Ilaiyaraaja, with cinematography by R. Rathnavelu and editing by Raghu Baabu.

Sethu, released on 10 December 1999, initially began running as a single noon show in a suburban theatre, but gradually built up audiences through word-of-mouth publicity. The film became a sleeper hit, and Vikram's first major breakthrough film. It won the National Film Award for Best Tamil Feature Film, and the Best Film award at the Filmfare Awards and the Cinema Express Awards. Bala and Vikram also won several awards for their contributions. The film was remade in Kannada as Huchcha, in Telugu as Seshu, in Hindi as Tere Naam and in Odia as Rakate Lekhichi Naa