The efficacy of 44 water extracts and 20 essential oils has been evaluated against V. dahliae in olive. Many treatments reduced mycelial growth, but only four essential oils showed effect against microsclerotia viability. Two essential oils from Thymus sp. showed effective control of Verticillium dahliae infection in olive plants. This is the first report of effectiveness of essential oils from Thymus spp. in controlling Verticillium wilt disease.