Data on the impact of COVID-19 on diagnosis, management and outcomes of women with GDM are few. Our aim was to evaluate the possible impact of lockdown on GDM diagnosis and follow-up. We retrospectively analyzed the GDM diagnostic modalities, the clinical-metabolic characteristics and the maternal and fetal outcomes in 48 GDM women followed during the lockdown (March-May 2020) and to compare the results with the 61 GDM women followed in the same period in 2019. We found no significant differences between the two groups in terms of diagnosis, clinical-metabolic characteristics and maternal and fetal outcomes. Therefore, we found that lockdown did not affect negatively maternal and fetal outcomes of GDM patients followed in this period.