Antimicrobial activities from hydrodistillated-essential oils and ethyl acetate extracts from fresh citrus peels were performed against various food-related microorganisms by broth microdilution assay. The ethyl acetate extracts showed stronger antimicrobial activity than the ones obtained from hydrodistillation. Particularly, the one from kaffir lime peel which showed broad spectrum inhibitory against all Grampositive bacteria (Table 2), yeast and mold (Table 3) tested. It exhibited MIC values of 0.28 and 0.56 mg/ml against Sac. cerevisiae var. sake and Bacillus cereus, respectively, while its MFC or MBC values for both microbes were 0.56 mg/ml. The MIC values of the ethyl acetate extract against L. monocytogenes, A. fumigatus TISTR 3180 and S. aureus were 1.13 mg/ml, while the MBC or MFC values for L. monocytogenes, A. fumigatus TISTR 3180 were 2.25 mg/ml and the value for S. aureus was 1.13 mg/ml. However, all Gramnegative tested including Salmonella sp. and E. coli O157: H7 were resistant to all citrus extracts at the concentration tested (Table 4). Gram-positive bacteria were more sensitive