Holidays contribute to the seasonal variations of population movements, infectious disease transmission dynamics, socioeconomic activities, and even the climate and environmental changes. WorldPop has systematically collated the datasets of public and school holidays in 2010-2019 across the globe to support the studies for understanding the mechanism and drivers of the seasonality of population mobility, social, demographic, economic, and environmental landscapes. These have been applied to map seasonal denominator dynamics in low- and middle-income settings and assess the spread risk of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in the COVID-19 pandemic. Further details on the methods can be found in Lai, S. et. al.