Legionella is a pathogenic bacterium that causes respiratory diseases and the most usual are Pontiac fever and Legionnaire's disease. The route of transsmision of Legionnaires disease is through contaminated aerosol. Therefore, the most important places that are controlled are spas and hotels, where where there a lot of peopleare staying and where a number of equipment that produce the aerosol are present. The objective of this study was to determine the antibacterial effect of 11 different volatile essential oils and their volatile active components to Legionella. L. pneumophila (strain 130b) grown on BCYE agar was used. Testing was based on the method of antibacterial activity of volatile components of the essential oil to inhibit the growth of L. pneumophila. The results showed different effect of the volatile components of the essential oil on Legionella. The best results showed immortelle essential oil with a zone of inhibition of 56.3 mm, while the weakest results showed blue chamomile oil with a zone of inhibition of 17 mm. Inhibition zone was absent for the thuja and laurel essential oils . The chemical components alpha pinene had the best result with the inhibition zone of66, 5 mm, while gamma terpinene had no antibacterial activity on Legionella pneumophila . In conclusion, the antibacterial properties of essential oils depends on the chemical composition of the oil and the synergistic effect of its chemical constituents. L. pneumophila showed great sensitivity to tested essential oil and it could found application as alternative method for prevention of legionellosis.