The adherence of healthcare professionals to vaccination is one factor that affects patients’ trust in preventive vaccinations, population vaccination coverage, and, as a result, the incidence of vaccine-controlled infections. Vaccination decision-making largely depends on the vaccination literacy level of healthcare professionals (VL), which determines their own adherence to immunization, the effectiveness of communication with patients, and the ability to create a positive attitude towards vaccination in society. Objective. To study the vaccination literacy of primary healthcare professionals in three regions of the Russian Federation. Materials and methods. An anonymous online survey of primary health care doctors of various specialties and nurses (n=1427) was conducted in three regions of the Russian Federation: Arkhangelsk Oblast, Altai Krai, and Sverdlovsk Oblast using an adapted version of the European HLS