Diatom is a unicellular, photosynthetic (autotrophic) alga, that has most distinctive features of crystalline extra cellular coat or frustules composed of silica and having unique patterns of symmetry and micro structure draws the attention of researchers worldwide. In this paper, identification of diatom flora of Garra River at Shahjahanpur, a small district in Uttar Pradesh India has been made from collected water samples at prone areas of drowning cases. For this purpose, 12 water samples were collected (4 at each site) in the month of January, February and March 2020 from different sites i.e. garra, hanumat dham, ram Ganga. Total 18 species of diatom were identified, in which 5 species were site specific. The diverse, asexually-reproducing organisms occur in a great variety of colors, sizes and shapes, most being unicellular but some forming simple colonies allows for their study to be of great use in certain legal investigations.