Diary is a 2022 Indian Tamil-language supernatural mystery thriller film written and directed by debutant Innasi Pandiyan and produced by S. Kathiresan. It was distributed by Udhayanidhi Stalin via Red Giant Movies. The film stars Arulnithi and Pavithra Marimuthu. The music and score is composed by Ron Ethan Yohann, with cinematography handled by Aravinnd Singh and editing done by S. P. Raja Sethupathi. It was shot extensively across Tamil Nadu including Chennai, Coonoor, Ooty, Mettupalayam and Coimbatore.