Summary—Radiological, cystoscopic and histological observations were made on 41 cases of urinary stones in a hospital in Zambia. The results of biochemical analysis of 31 of these stones are presented. The possible role ofSchistosoma haematobiumin the causation of urinary stones has been analysed; associated schistosomiasis was diagnosed in 17 cases (41.4%). It is concluded that there is no significant causal association between the two disorders and urolithiasis is an uncommon disease in Zambian