Introduction: Following the COVID-19 lockdown, the introduction of powered mopeds and scooters into urban mobility in Mongolia, without basic traffic regulatory frameworks such as vehicle classification, participation rules, age limits for riders, or parking regulations may have contributed to an increased risk of pedestrian injuries. Objective: To examine temporal trends in pedestrian injuries in Mongolia and to assess the impact of the emergence of micro mobility, while accounting for COVID-19 lockdowns, using an interrupted time-series analysis. Methods: We conducted an interrupted time-series analysis using national data on pedestrian injuries in Mongolia from January 2016 to December 2024. Monthly pedestrian injury rates per 10,000 population were calculated and stratified by age groups, regressing it on the number of months after January 2016 (the beginning of the study), after November 2020 (the lockdowns started), after May 2021 (the lockdown lifted and new mode of urban transportation started to release). Results: During the 9-year study period, there were 41,063 pedestrians, of whom 51.5% were male. The monthly rate of overall pedestrian injury started to decrease after the COVID-19 lockdowns possibly due to reduced traffic activity. However, following the lifting of restrictions, the trend started to increase among the age groups under 10 years (1.8%, 95% CI: 0.8–2.8), 10–19 years (1.6%, 95% CI: 0.3–2.9), 50–59 years (0.6%, 95% CI: 0.1–1.2), and 60–69 years (1.3%, 95% CI: 0.4–2.2). Conclusion The increase in pedestrian injuries suggests that the emergence of micromobility may have contributed to higher injury risk for pedestrians in Mongolia. This highlights the urgent need for change in infrastructure and regulations governing micromobility usage to enhance pedestrian safety.