Thanneer Mathan Dinangal (transl. Watermelon Days) is a 2019 Indian Malayalam-language coming-of-age comedy-drama film co-written and directed by Girish A.D., and jointly produced by Jomon T. John, Shebin Backer, and Shameer Muhammed. The film stars Vineeth Sreenivasan, Mathew Thomas and Anaswara Rajan. The music was composed by Justin Varghese. The film follows Jaison, a teenager, who has a crush on Keerthy, but she does not reciprocate his feelings. To make things worse, he gets in trouble with Ravi, the new teacher who is liked by everyone, especially Keerthy.

The film was released on 26 July 2019 and was met with a positive critical response and performed well at the box office too, becoming the third-highest-grossing Malayalam film of the year.