Mohit Raina career began in 2005 when he acted in a science ficn TV show called Antariksh. In 2008, he starred as JaiKishan in the comedy film Don Muthu Swami, which was not a success at the box office and caused him to return to television work. In 2009 he appeared in the Chehra TV series, a suspense drama revolving around a handicapped girl. Mohit played her husband Garv, a young business tycoon. He was also a part of Bandini.

In 2011, he was cast as the lead in Nikhil Sinha's Devon Ke Dev – Mahadev. The series focused on the god Shiva and portrays his journey from a hermit to a householder through his marriage to Sati and later to Parvati. Mohit worked on improving his physique for the role, and started learning the Indian classical dance form Kathak, which is integral part of his role as Shiva. The Times of India said the role created fans due to his "fab abs, groovy smile and acting chops" He played over 30 different characters in the series, which ran for three years, ending in Dec 2014.

Mohit has played the adult emperor Ashoka, in the historical serial Chakravartin Ashoka Samrat on Colors TV. The series started broadcasting from 2 May 2016. After Ashoka, Mohit also played the lead role as Havildar Ishar Singh in 21 Sarfarosh - Saragarhi 1897 which is based on the Battle of Saragarhi.