Entomopathogenic nematodes (EPNs) have excellent bio control potential for management of insect pests of economic importance. In the present study, dispersal of EPN species, Steinernema abbasi Elawad, Ahmad and Reid, 1997 and Heterorhabditis indica Poinar, Karunakar and David 1992 by common Indian earthworm species, Pheretima posthuma Vailliant, 1868, as well as safety of using both these EPN species towards P. posthuma were investigated under laboratory conditions. Vertical dispersal (upward as well as downward) of both entomopathogenic nematode species combined with earthworms was carried out in autoclaved soil filled in polyvinyl chloride pipe columns. Here after, the toxic impact of these EPN species towards earthworms applied at two different concentrations in autoclaved soil was studied. Upward as well as downward dispersal of EPNs was significantly greater in soil in the presence of earthworms relative to soil without earthworms. Also, the tested nematode species were found to be safe towards P. posthuma as they did not cause any earthworm mortality up to 3 weeks of treatment when applied at a dose of as high as 200 infective juveniles/ gram soil. It is concluded that presence of earthworms in the soil can have positive impacts on the host finding ability of the entomopathogenic nematodes due to their increased dispersal. Also, the tested EPN species had neutral impacts on survival of the earthworm species, P. posthuma. Therefore, we need to consider the role played by species-specificity in these interactions in order to use them effectively in devising bio-control programmes at field level.