Patulin is a mycotoxin produced by several Penicillium, Aspergillus and Byssachlamys species. Patulin can be produced on different food products including fruits, grains, cheese, cured meats, but in natural situations patulin is exclusively found in apple and apple products. Patulin, at dose of 0.1 mg/kg bw/day, was administered by gavage to the growing male rats aged 5-6 week for 60 or 90 days. At the end of the experiment, sperm counts and morphology were investigated. Also, effects of patulin on the epididymis, seminal vesicle and prostate tissues were examined histopathologically and morphologically.