Rathna Kumar is an Indian film director and writer. He is known for directing Meyaadha Maan (2017).

Kumar began his career with the low-budget film Madhu, which was included in an anthology film called Bench Talkies. He later turned the short film into a feature film titled Meyaadha Maan (2017). The film turned out to be a success and an important film in Vaibhav's career because the film was not a multistarrer and several of Vaibhav's successful films had only been multistarrers. He went on to direct Aadai (2019), starring Amala Paul. The film released to mixed reviews, but highlighted an important aspect of society. Kumar was signed as a co-writer to Lokesh Kanagaraj's Master. Regarding his decision of becoming a writer from a director, Kumar told The Times of India that Kanagaraj is his friend.