COVID-19 vaccination in Romania started on 27 December 2020. It was announced that the process would be divided into three phases. Medical personnel would be vaccinated first (first phase), followed by the population at risk (second phase), and finally by the rest of the population (third phase). Vaccination was declared free and non-mandatory. As of March 2022, five types of vaccines (Pfizer/BioNTech, Moderna, Oxford/AstraZeneca, Janssen and Novavax) were authorized to be used in Romania. This is the largest vaccination campaign in the modern history of Romania.