Hypersensitivity pneumonia is an inflammatory interstitial lung disease caused by immune response due to inhalation of various organic and chemical substances. Bird fancier’s lung disease is a hypersensitivity pneumonia which develops in response to organic bird products. Hypersensitivity pneumonitis is caused by many birds, especially pigeon. In the current case, the diagnosis was subacute hypersensitivity pneumonitis. Thirty two year-old male was admitted to chest diseases outpatient clinic due to two months of effort dyspnea, dry cough, fever, sweating, fatigue and weight loss. The patient has a history of pigeon feeding. The patient was diagnosed as pigeon fancier’s lung disease by the help of the history, physical examination, pulmonary function tests, chest radiography and highresolution computed tomography findings, and he had prednisolone therapy. As a result, an early diagnosis and then early treatment after the necessary precautions are very important to avoid chronic progress of these diseases.