The present study was undertaken to assess the effects of the pyrethroid insecticide, deltamethrin on reproduction of male albino rats and the possible ameliorative role of propolis. Treating rats with deltamethrin (1/10 LD50) brought about marked reduction in sperm counts, increase in sperm head abnormalities and a decrease in serum testosterone and L.H concentration. Histological examination of the testes revealed severe degenerative changes in seminiferous tubules with reduction of germ cells. Moreover, total carbohydrates and proteins diminished in the testicular tissue. Animals treated with deltamethrin and propolis showed an improvement in the testicular damage, increase in sperm count, increase in testosterone and L.H, and decrease in sperm head abnormalities. Testicular carbohydrates and proteins increased. It is supposed in this work that propolis ameliorated deltamethrin-induced reproductive toxicity in male rats and this might due to the antioxidant activity of its flavonoids compounds.