A 13-yr-old male addax (Addax nasomaculatus) presented with locally extensive alopecia, slight erythema, and skin thickening on the medial aspect of the left rear leg between the stifle and tarsus. Cutaneous T-cell lymphoma was diagnosed after histopathology and immunohistochemical staining of representative skin-punch biopsies. No treatment was elected, and the addax was euthanized 3 yr later because of poor body condition, chronic dental disease, and confirmed spread of lymphoma to other cutaneous locations. Postmortem evaluation revealed spread to multiple lymph nodes but no further organ metastasis. Serologic testing on archived serum for bovine leukemia virus (BLV) revealed no evidence of exposure or infection. In cattle, cutaneous lymphoma is a sporadic form of lymphoma that is relatively rare, not typically associated with BLV infection, and occurs in young animals (<3 yr). This is the first report of cutaneous lymphoma in a nondomestic bovid.