Since transitioning out of communist socio-political orders, more than a dozen Central and Eastern European (CEE) countries have experienced mass shootings. To date, scholars have yet to identify a sample of cases that occurred throughout these regions of the world. This study puts forward the first collection of data on attempted and completed mass shootings through introducing 76 cases that occurred in 15 countries from 1993 to 2021. Data comprise 24 variables including offender characteris...