Silene koycegizensis Donmez & Vural sp. nova and S. cariensis Boiss. subsp. muglae Vural & Donmez subsp. nova (sect. Behenantha Othh.) are described from Turkey. Diagnostic characters, description, detailed illustrations and taxonomic comments on the taxa are given. Their relationships with the allied species S. cretica L., S. tenuiflora Guss. and S. cariensis are discussed. Geographic distributions of the new taxa and other related species are shown on maps.