Kumari 21F is a 2015 Indian Telugu-language romantic drama film written by Sukumar and directed by Palnati Surya Pratap. Produced by Sukumar Writings and P. A. Motion Pictures, the film stars Raj Tarun and Hebah Patel. Kumari 21F focuses on a romantic relationship between Siddhu, a chef and Kumari, a struggling model.The film marks the debut of Sukumar, a director and screenwriter in Telugu cinema, as a producer. The film was produced on a budget of ₹6–15 crore. Sukumar took inspiration from his youthful college days in Razole where a young woman went to a picnic with some young men; a major undertaking for a woman at that time, which earned her the undeserved label of a "loose" character.

Devi Sri Prasad composed the film's background score and music and R. Rathnavelu was the director of photography. Neither Prasad nor Rathnavelu charged any remuneration for the film. Principal photography commenced in December 2014 and was finished in 70 working days; according to Rathnavelu, lighting played a key role during the filming process and digital low lighting photography techniques were used.

Kumari 21F was released worldwide in theatres on 19 November 2015 in about 500 screens. It received mostly positive critical response; praise was directed towards the film's climax, performances (especially Hebah Patel), screenplay, cinematography and music. The film grossed ₹38 crore and earned a distributor share of ₹18 crore at the end of its run. It was declared a commercial success based on the return on distributor's investment of ₹10 crore and became the twelfth highest grossing Telugu film of the year. The film was remade in Kannada language with the same title and released in 2018.