In recent years, the metabolic syndrome has garnished much attention in Korean population. This condition is multi-faceted and potentially leading to significant disturbance of numerous physiological processes including male reproductive function. The risk factors of the metabolic syndrome have been thought to have a detrimental effect on semen quality, and several studies have addressed the impact of these factors on male fertility. This review article evaluates the medical literature on the metabolic syndrome and its association with male reproductive health. The implications of obesity, diabetes, dyslipidemia, and hypertension are each examined with regard to their associated detrimental effects on male fertility.