Fusarium oxysporum f.sp. lentis is an important cause of root and stem rot of lentil that attacks its host at all stages of plant growth including germination, seedling and adult plant. In this research, reaction of 38 genotypes of lentil to Fusarium oxysporum f.sp. lentis based on the percentage of dead plants and some agronomic traits in both of seedling (fourth week) and physiological maturity (eighth week) stages, under greenhouse conditions was investigated. Analysis of variance in percentage of dead plants showed that between the genotypes, the growth stages and their interactions significant differences were obsorved (p