Diary is a 2022 Indian Tamil-language supernatural mystery thriller film written and directed by debutant and produced by S. Kathiresan under the banner of Five Star Creations LLP. The film was distributed by his cousin Udhayanidhi Stalin under his banner Red Giant Movies. The film features Arulnithi, Pavithra Marimuthu and Chaams in lead roles.The film's music and score is composed by Ron Ethan Yohann, with cinematography handled by Aravinnd Singh and editing done by S. P. Raja Sethupathi.