In this report, a case of bronchioloalveolar carcinoma was described in a 4-years-old female Van cat. Grossly, multiple 1-3 mm greyish-nodules were found throughout all the lung lobes. The tumor implantations were also observed as numerous firm greyish-white nodules of 1-5 mm in si2e in diaphragm and parietal pleura. Metastases were lound in the bronchial and mediastinal lymph nodes. Microscopically, the lumor cells were arranged as papillary and glandular slructure. immunohistochemically, some tumor markers, such as cytokeratin, vimentin, car-cinoembryonic antigen (CEA), alfa-1-antitripsin, and proliferative cell nuclear antigen (PCNA) was investigated From these, cytokeratin and PCNA were found to be positive.