ackground: Male infertility affects a significant proportion of couples trying to conceive because of a variety of factors, such as low sperm count, abnormal sperm morphology, erectile dysfunction, varicocele, infections, and hormonal imbalances. This study aimed to assess the prevalence of male infertility in Nairobi, Kenya, and to better understand the causes of male infertility and improve outcomes for couples struggling to conceive.
 Methods: A retrospective study was conducted at an infertility clinic in Nairobi, Kenya between February 2021 and September 2022. 115 men who underwent semen analysis were chosen. Descriptive statistics were calculated for demographics and sperm parameters using SPSS version 27. 
 Results: The average age range of study participants was 21-56 years. In most cases, 63% had progressive sperm motility, 28.3% had nonprogressive motility, and 8.7% had sperm immotility. A sperm concentration of <15 million/ml was reported in 24% of men. Of these, 40% had abnormal forms of sperm morphology. 25% had abnormal sperm vitality (<54% of sperm are alive). 32.7% of men had normozoospermia, 20.6% had asthenozoospermia, 11.5% had oligospermia, 6.06% had azoospermia, 21.2% had teratozoospermia, 7.27% had hypospermia, and 0.606 had hyperspermia. All semen abnormalities were more common among middle-class and upper-class males with an income of more than 150,000 per month, aged >35 years, and smokers.
 Conclusion: Male infertility is an increasing problem in lives of married couples. Age, occupation, stress, and lifestyle have a significant impact on the quality and quantity of sperm. Couple education on factors affecting male infertility should be encouraged. Clinicians should investigate males for the cause of infertility in couples.