Brucella is a gram-negative intracellular microorganism that can infect humans when they come into contact with infected animals or consume certain foods, such as raw milk, unpasteurized cheese or undercooked meat.Brucellosis frequently develops with lung involvement.We present here a case who presented with brucellosis mimicking lung cancer.Although pulmonary involvement is a rare manifestation of brucellosis, it should be considered in the presence of persistent fever, arthralgia and pulmonary symptoms in areas where the disease is widespread.Lung cancer is carefully investigated by physicians due to its prevalence in the community and the high mortality rates involved, while brucellosis is less common in the community and has a relatively better prognosis.Brucellosis may be missed in patients lacking accurate anamnesis.Prolonged examination and treatment processes may lead to unnecessary expenses and the progression of the disease due to late diagnosis.