In vitro radical scavenging activity and the total phenolic content (Folin-Ciocalteu method) of two solvents (methanolic and ethyl acetate) extracts of some plants grown in Turkey were studied by using 1,1-diphenyl-2- picrylhydrazyl (DPPH) scavenging assay. Although the total phenolic content of the ethyl acetate extract of R. officinalis (41.8 mg GAE/g dry weight) is higher than that of L. angustifolia 12.7 mg GAE/g dry weight), the corresponding radical scavenging activity of R. officinalis (19.3 %) is higher than those of other plants. The total phenolic content of the methanolic extract of R. officinalis (34.8 mg GAE/g dry weight) is higher than those of other plant species. At the same time, its corresponding antioxidant activity is higher (21.8 %). It was established that there was positive linear correlation between radical scavenging activity and total phenolic contents.