The aim of this study was to evaluate the predacious capacity in vitro of eight isolates of nematophagous fungi: four of Arthrobotrys sp., one of Arthrobotrys oligospora, one of Duddingtonia flagrans, one of Dactylaria sp. and one Monacrosporium eudermatum. Nine groups of Petri dishes with 13 repetitions each were set up. The fungi were seeded in fluor-corn-agar media, following this each Petri dish was added with 150 larvae of the free living nematode Panagrellus redivivus. Five days after larval addition these were collected by Baermannization and were quantified. A significant difference (p < 0.05) between all treated group was observed respect with the control. Isolates FTHO-8 D. flagrans, R6 M. eudermatum, DAC Dactylaria sp. as well as FTHO-4 and FTHO-6 Arthrobotrys sp., showed an excellent predatory activity (> 90%) and they could be considered as potential bio-control agents in future field trials.