A new species of Teucrium L., Teucrium aladagense Vural & H. Duman, is described from Aladag mountain, located in Adana, Kayseri, and Nigde provinces in Turkey. The species belongs to Teucrium L. sect. Stachyobotrys Benth. A description, distribution map, habitat, information on trichome morphology, and the threatened category of the species are provided. The differences between the new species and its allies T. lamiifolium d'Urv s.l. and T. hircanicum L. are discussed, and an identification key is provided for the identification of similar taxa.