In the present study, 21 species belonging to 12 genera of the class Cyanophyceae have been identified during a year round study (July 2013 - June 2014) from Kaylana Lake, Jodhpur. Out of 21 species, 15 species belongs to Nostocales order and 6 to Chroococcales order. Maximum number of species was observed during summer season (21 species) followed by rainy season (16 species) and least in winter season (14 species). Microcystis aeruginosa was observed dominant during the study period. Oscillatoria was represented by maximum number of species (5). Cyanophyceae showed distinct seasonal variations in density as well as in number of species.