Beside their ability to fix atmospheric nitrogen, cyanobacteria are known to secrete into the surrounding medium a variety of compounds that could ameliorate or enhance seed germination and growth of rice plants. in an attempt to expound how far the tested cyanobacterial candidates could contribute to rice development. 24-48 hrs and 4 days laboratory incubation experiments in the dark were carried out where three rice cultivars (Giza 177, Giza 178 and Sakha 101) were determined for seed and seedling growth when treated with cell-free extracts (filtrates) of cyanobacterial strains namely, Anabaena oryzae, Nostoc cafcr'cola, Microchaete tenera and Cyiindrospermum muscicofa, each separately Results indicate that cyanobacterial culture extracts (filtrates) had stimulated roots and shoots growth of rice seedlings besides increasing seed germination % for the tested rice cultivars N. caicicoia had recorded the highest percentages germination of 98, 92 and 90 for rice seeds cultivars Giza 1V8, Sakha 101 and Giza 177 after 48 h Incubation in the dark Extending the incubation period to 7 days, again N. calorcola supported greater growth pattern of rice roots and shoots than other cyanobacterial candidate