Diploma research at the College of Medicine at Basra University discussed the level of vitamin D among infertile men in the city of Basra. The research presented by the student Warka Marid aims to clarify the role of vitamin D in treating infertility cases because of its role in treating male infertility cases. The research concluded that vitamin D has an effective role in treating male infertility, and its deficiency has a clear role in sterile men. The research recommended the need to treat vitamin D deficiency in infertile men.