Aim. To identify the clinical and anamnestic risk factors of preeclampsia (PE) in gestational diabetes mellitus (GDM). Design. Open-label observational prospective study. Materials and methods. The study enrolled 204 pregnant women with GDM, 70 of which had their pregnancy complicated with PE (study group) and 134 patients did not have PE (controls). In the study group, clinical and anamnestic risk factors were searched for by tracing data from primary medical records. The age of participants was 21 to 46 years old. Extragenital conditions were studied as possible risk factors of PE in GDM. Results. It has been established that GDM with PE was more likely to be associated with chronic arterial hypertension (CAH) (χ2 = 7.72, р = 0.006, odds ratio (OR) = 8.52, 95% confidence interval (CI): 1.76–41.29); a history of respiratory diseases — severe sore throat (χ2 = 6.2, р = 0.01, OR = 3.98, 95% CI: 1.40–11.27), chronic tonsillitis (χ2 = 12.84, р < 0.001, OR = 4.81, 95% CI: 2.03–11.40), acute bronchitis (χ2 = 6.0, р = 0.02, OR = 7.33, 95% CI: 1.48–36.32) than GDM without PE. Conclusion. Clinical and anamnestic risk factors of PE in women with GDM are CAH, a history of respiratory diseases (acute bronchitis, severe sore throat, chronic tonsillitis). Keywords: gestational diabetes mellitus, preeclampsia, risk factors.