Aim: Sarcoidosis is a multisystemic disease, characterized by noncaseating granuloms, the aetilogy remains unknown. We have stated that sarcoidosis diagnosis used by mediastinoscopy and our patients evaluated by stage and clinical features. Material and Method: 38 cases with a diagnosis of sarcoidosis by mediastinoscopy in our clinics (University Hospitals of Western Black Sea) were retrospectively analyzed. Cases was staging according to posteroanterior chest x-rays. Admission complaints,Pulmonary Function Tests, diagnostic methods, disease stages, co-morbid diseases, clinical and laboratory features of the patients were assessed. Results: 26 of the patients were female, 12 were male. Mean age was 49 and age range was between 24-71 years. Most common complaint at appeal was cough, and the most common radiological stage was 2. The most common biopsy taken from the lymph nodes was right paratracheal (2R, 4R) , the least common was the left paratracheal lymph nodes. There was no mortality. Complications developed 3 patients. Discussion: Sarcoidosis diagnoses usually settled was in stage 2 with hilar lymphadenomegalia and lung parenchymal infiltration. Mediastinoscopy in the diagnosis of sarcoidosis with mediastinal lymph node biopsy is an effective procedure with quick results, low morbidity and mortality rates.