This randomized controlled animal study examined chronic 35.5 GHz millimeter wave exposure in male Wistar rats (2 hours/day for 60 days) compared with control and sham groups. The exposed group showed reduced sperm count and viability along with testicular histopathological changes. Oxidative stress markers shifted toward increased lipid peroxidation and reduced antioxidant defenses, and comet assay results indicated increased DNA damage.