Spontaneous miscarriage is the spontaneous ending from a pregnancy at a phase where the embryo is incapable of remaining independently, generally defined in humans at prior to 20 weeks from gestation. Overall, reported spontaneous miscarriage rates in recognized pregnancies are 10% to 20%. Pregnant women are exposed to many infectious agents that are potentially harmful to the fetus and an increased risk of miscarriage. The aims of the study were to evaluate the role of many pathogens (Parvovirus B19, Cytomegalovirus, Rubella, and Toxoplasma gondii), and urinary tract infections (UTI) as causes of spontaneous miscarriage. A case-control study conducted in Baghdad Teaching hospital during a period of ten months. A total of 120 women aged between (20 to 25) years were enrolled within the study, 80 with spontaneous miscarriage as a study group and 40 with normal delivery as a control group. A full history was taken, clinical examination was done and various laboratory investigations were carried out for all women in both groups. The study showed a statistically significant correlation between viral infection, Parvovirus (IgM, IgG), Toxoplasmosis (IgM), Rubella (IgM) and Cytomegalovirus (IgM, IgG), with spontaneous miscarriage (P-value 0.001, 0.005, 0.008, 0.014, 0.002). Bacterial, viral and protozoal infection may increase the risk of spontaneous miscarriage in comparison to healthy normal delivery ladies.