O2 is a 2022 Indian Tamil-language survival film written and directed by G. S. Viknesh and produced by Dream Warrior Pictures. It stars Nayanthara and "Rithu Rocks" Rithvik. It received mixed reviews upon its release praising the performance of Nayanthara.

Nayanthara is an Indian actress who predominantly appears in Tamil, Telugu and Malayalam films. One of the highest-paid actresses in India, Nayanthara was the only South Indian actress to be featured in the Forbes India "Celebrity 100" list of 2018. She has acted in more than 75 films in a career spanning over two decades and has won numerous awards, such as five Filmfare Awards South, one Tamil Nadu State Film Award and a Nandi Award.