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Background: Male sterility results from high testicular temperatures, which affect mammalian spermatogenesis. High testicular temperatures affect sperm motility, morphology and fertility according to their magnitude and duration. Aim: The aim of the current study is to examine the effects of heat-induced oxidative stress and cinnamaldehyde on Wistar rat testicular structure and function. Settings and Design: The rats used in this experiment were Wistar albino rats. Materials and Methods: This research has six animals per group. Male Wistar albino rats of 2.5-3 months old and 275-300 g. (I) control, (II) heat stress (HS) in a closed chamber at 41°C for 14 days and (III) HS with cinnamaldehyde (CA) 50 mg/kg body weight for 14 days. (IV) CA alone. After the study, the animals were euthanised, and test samples were taken for sperm count, morphology, haematoxylin and eosin stain for normal cellular morphology, antioxidants and DNA integrity assessments. Statistical Analysis Used: The data were analysed statistically using one- and two-way ANOVA tests for comparisons between groups. Results: The stress group had significantly lower sperm counts and poor sperm morphology. The stress group's antioxidant capacity is much lower than that of the control group. Animals under stress have fragmented DNA. Treatment with cinnamaldehyde increased overall antioxidant capacity and seminal parameters, and rats behaved most like controls. Conclusion: CA restores malondialdehyde levels, total antioxidant capacity, sperm characteristics and mitigates testicular damage in rats exposed to experimental HS. [ABSTRACT FROM AUTHOR]