In this study, antimicrobial activity of Rhododendron ponticum L., Prunus laurocerasus L., Agrimonia eupatoria L., Cornus mas L., Vitis vinifera L., Punica granatum L., Anthemis cotula L., Cichorium intybus L., Viscum album L., Papaver hybridum L., Malva rotundifolia L. and Rhus coriaria L. were investigated. The ethanolic extracts of these plants were tested against Escherichia coli ATCC 11230, Staphylococcus aureus ATCC 6538P, Klebsiella pneumoniae UC57, Pseudomonas aeruginosa ATCC 27853, Proteus vulgaris ATCC 8427, Bacillus cereus ATCC 7064, Mycobacterium smegmatis CCM 2067, Listeria monocytogenes ATCC 15313, Micrococcus luteus CCM 169, Candida albicans ATCC 10231, Rhodotorula rubra DSM 70403 and Kluyveromyces fragilis ATCC 8608 by disc diffusion method. Of the 12 plants tested, nine showed antimicrobial activity. Each plant species has unique against different microorganisms. The fruit extract of Rhus coriaria had the highest antimicrobial effect with an inhibition zone of 12-52 mm against all the bacteria, but not shown antiyeast effect. Except for the extracts of Rhus coriaria, Agrimonia eupatoria and Anthemis cotula, all additional extracts of generated inhibition zones smaller than those generated by several reference antibiotics.