Tonic is a 2021 Indian Bengali-language family drama film directed by Avijit Sen, produced by Atanu Raychaudhuri and distributed by Bengal Talkies. The film revolves around an elderly couple, played by Paran Bandopadhyay and Shakuntala Barua, who get to enjoy a fresh lease of life through their tourist guide, Tonic (Dev).

Tonic marked the directorial debut of Avijit Sen, who had previously worked as an assistant director to Rajkumar Hirani. His Tonic, Projapoti and Pradhan's Directional style influenced by Ventarnal filmmaker Tarun Majumdar. He also wrote the story of the film, which he completed in a year by taking cues from his own life. Supriyo Dutta is the cinematographer for the film, while Sujay Datta Ray is the editor. It was jointly distributed by Bengal Talkies and Dev Entertainment Ventures.

Upon its premiere on 2 December 2021, Tonic opened to positive reviews and became a huge commercial success, eventually becoming the highest-grossing Bengali film of 2021. The chemistry between Dev and Paran Bandopadhyay won appraisals besides the plot and other elements. At the 5th Filmfare Awards Bangla, the film received six leading nominations and won three, including Best Film, Best Actor (Bandopadhyay) and Best Debut Director (Sen).