Aerial parts of Sideritis cilicica Boiss. ct, Bal. and Sideritis bilgerana P.H. Davis (Lamiaceae) were h y vdrodistilled to obtain essential oils that were then analyzed by GC and GC/MS. beta-Pinene (39%), alpha-pinene (28%), and beta-phellandrene (20%) were the main components in the oil of S.cilicica, while beta-pinene (48%), and alpha-pinene (32%) were the major constituents in the oil of S. bilgerana. The antimicrobial activities of the oils were evaluated by using the microdilution broth method. Both of the oils showed good inhibitory effects on C. albicans.