Objective To characterize the physical activity (PA) level in patients with a cardiac implantable electronic device (CIED) during the COVID-19 pandemic and compare PA level during the pandemic in 2020 to the year 2019. Methods We performed a retrospective analysis of PA activity in individuals implanted with a CIED enrolled in the BIOTRONIK CERTITUDE Registry.Mean daily and weekly PA from January to August 2020 was compared to 2019. Results A total of 21,660 individuals met eligibility criteria, with mean age of 72.6 ± 11.6 years, and 57.4% were males. A significant decline in daily PA was noted following the pandemic declaration in 2020, with a maximum mean reduction of -24.5 ± 36.3 minutes (p<0.0001) observed in April 2020 compared to 2019. PA in 2020 increased from April to May (120.6 ± 67.4 to 129.2 ± 70.9 minutes/day). PA was lower for all months in 2020 compared to 2019. The decrease in PA was seen in all pre-specified groups based on age, gender, type of device, and region of the country. Conclusion Following the declaration of the COVID-19 pandemic a significant decline in daily PA was observed in individuals with a CIED. Future investigation to establish the impact of this reduction on short and long-term cardiovascular outcomes is required.