The floristic diversity is the natural resource and wealth of a region and acquiring knowledge of it is of immense scientific and commercial importance. The present work aimed to study the floristic diversity of Northern Tropical Semi-evergreen forests of Dhenkanal district of Odisha during 2014-2016. The data was collected by sampling using quadrats of 10×10m size. Ten quadrats were randomly placed at each study site. The size and number of the quadrats were determined by the species area curve method. The data were quantitatively analyzed for ecological and phytosociological analysis. Their relative values were calculated and summed to get Important Value Index (IVI) of individual species. The species were identified by following available literatures including Flora of Odisha (Saxena & Brahmam, 1994-96). The findings had very good indication towards the rich vegetation diversity in the district particularly in forests but the deforestation in the name of industrialization and economic development posing a major threat to the pristine forest.