Eryngium babadaghensis G.Ecevit-Genc, E.Akalin & A.Worz sp. nova (Apiaceae, Saniculoideae) is described as a new species from the Babadag (Fethiye-Mugla) in south-west Turkey. The new species is closely related to E. kotschyi Boiss., which is endemic to Turkey. A Latin diagnosis; taxonomic descriptions; photos of the holotype, fruit, and transverse sections of the basal leaves, peduncles, and fruits; and scanning electron microscope (SEM) images of the calyx and surface of the scales on the mericarp of the new species are presented. The geographical distribution of the new species and E. kotschyi are mapped. Diagnostic characters of E. babadaghensis and E. kotschyi are presented with photos and in a table.