Campanula mugeana Yldrm (Campanulaceae) is described as a new species. Diagnostic morphological characters, full descriptions and detailed illustrations of the new species are given. Micrographs of seeds and pollen were taken with scanning electron microscopy (SEM). Campanula mugeana is restricted to the province of zmir in western Anatolia, Quinqueloculares, subgenus Campanula based on floral features. Although C. mugeana has no close relatives within sect. Quinqueloculares, it shows some morphological similarities with C. saxatilis and C. davisii.