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Fertility control with medicinal plants has been reported in the ancient and modern medical literature. In this research, the effects of methanol and oil extracts of Ocimum gratissimum (OG) on testicular morphology and epididymal sperm reserve were investigated in adult male Wistar rats. Fifty-five rats divided into 5 groups A-E of 11 rats each was used for this study. Methanol and oil extracts of Ocimum gratissimum were administered at two doses 250 and 500 mg/kg for 28 days. Animals in control group A received distilled water for the same duration. At day 14 and 28 of the study, five animals were sacrificed from each group, and their blood and testes samples were collected for the analysis. Spermiogram, testicular biometry, serum testosterone assay, and testicular morphology were assessed from harvested testes. The results revealed that there was no significant difference (p > 0.05) in serum testosterone level. There was also no significant difference (p > 0.05) in sperm volume, livability and abnormalities but there was significant differences (p < 0.05) in the sperm motility and concentration. Testicular biometry and testicular morphology between control and treated groups did not reveal any significant differences (p > 0.05). The study showed that methanol and oil extracts of Ocimum gratissimum (OG) did not have any inhibitory effect on the reproductive function and fertility of adult male albino rats. Further works should be carried out on isolated active fractions of this plant on male fertility. Keywords: Herbal remedies, Medicinal plants, Spices, Testicular biometry, Sperm livability