The Priyanka Chopra-starrer movie was named the best popular film providing wholesome entertainment.
Film's screenwriter Saiwyn Quadras took to Twitter to express his excitement.
"Yippee to team #MaryKom @priyankachopra @OmungKumar @Vanita_ok @MangteC @OnlerK We won the National Award best film," Quadras posted on Twitter.
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The tweet was later retweeted by the biopic's director Omung Kumar, who made his Bollywood debut with the film.
Released last September, the Manipur-set drama also starred Darshan Kumaar and Sunil Thapa in prominent roles.