Data for 2020 should be interpreted taking into account the effect of the COVID-19 pandemic, which could have resulted in changes in long-term trends, but in particular contributed to a strong decrease in the number of cases not only of giardiasis, but also of other infectious diseases. In 2020, almost all EU/EEA countries reported a decrease in the incidence of giardiasis similar to that in Poland. However, as in 2019, in 2020 Poland differed from other EU/EEA countries in terms of incidence by age and sex.