The spleens from 12 broiler chickens 45 to 52 days old that were diagnosed as having chronic congestive spleen during a chicken inspection were subjected to pathological investigation. The spleens were enlarged, weighing 23 to 114 grams, discolored and firm in all 12 cases. On the cut surface showing bulging, their capsules were thickened and pale yellowish tissue dendritically or massively proliferated into the dark-red parenchyma. Histopathologically, the splenic capsules and trabeculae were thickened due to proliferation of fibroblast and collagen fiber. Lymphocytes composing the white pulp were decreased in number, and the dilated red pulp was filled with erythrocytes. Organized thrombi and chronic to subacute inflammation were observed in the intrasplenic branches of the splenic veins in 3 and 2 cases, respectively. The results suggest that the venous lesions were implicated as a contributing factor in chronic congestive spleen in the chickens.