A detailed survey was under taken to study the occurrence and diversity of fishes in Semara taal, a naturally occurring wetland near Shohratgarh of Siddharthnagar district of Uttar Pradesh. The present survey was conducted from Jan 2018 to Dec 2018 to find out the ichthyo-diversity of Semara taal. A total of 29 species of fishes belonging to 20 genera, 15 families and 8 orders were identified during entire survey and observation. This was the first systematic survey on the fish diversity of this wetland. Order Siluriformes was found most dominant represented by 10 species, followed by Cypriniformes with 7 species; Perciformes and Ophiocephaliformes are with 3 species; Osteoglossiformes, and Synbranchiformes with 2 species while Clupeiformes and Beloniformes representing by only one species.