In this research, the antimicrobial effects of ethanolic, methanolic and aqueous extracts obtained from aerial parts, leaves and bulbs of six species of Fessia were investigated on the growth of some of micro-organisms, including Staphyloccocus aureus, Bacillus anthracis, Kelebsiella pneumonia and Candida albicans. Plant samples were collected from natural habitats and were then identified. The evaluation diameter of inhibitory zone, well and MIC (minimum inhibitory concentration) methods were used for the assessment. Aqueous and methanolic extracts obtained from the leaves and bulbs did not affect any of the studied micro-organisms. The results showed that ethanolic extract of the species Fessia khorassanica, had stronger inhibitory effect on the Candida albicans in comparison with the control group.