Aranmanai 3 (transl. Palace 3) is a 2021 Indian Tamil-language horror-masala film written and directed by Sundar C. The film stars Sundar alongside an ensemble cast including Arya, Raashii Khanna and Andrea Jeremiah, with Sakshi Agarwal, Vivek, Myna Nandhini, Yogi Babu, Nalini, Manobala, Sampath Raj, Ovi Bhandarkar, Vincent Asokan, Madhusudhan Rao and Vela Ramamoorthy. It is the third instalment in the Aranmanai film series, produced by Khushbu Sundar under Avni Cinemax, with cinematography by U. K. Senthil Kumar, music composed by C. Sathya, and film editing by Fenny Oliver. The story revolves around Jyothi (Khanna), who is threatened by a vengeful spirit, as she tries to discover the truth with her relative Ravi (Sundar).

The film marks the posthumous release of actor Vivek. Aranmanai 3 was released by theatrically on October 14 2021, coinciding with Ayudha Pooja, and received mixed to negative reviews from critics and audiences, but was a commercial success at the box-office.