INSPIRE theme “Environmental Monitoring Measures” data set, which provides information on the monitoring system of environmental elements (including atmosphere, land surface and groundwater, groundwater, territorial waters in the Baltic Sea and the Curonian Lagoon) in the Republic of Lithuania. In Lithuania, monitoring sites, objects, objectives, plans and activities are included and described in the State Environmental Monitoring Program. The procedure for carrying out monitoring is also regulated by the Law on Environmental Monitoring of the Republic of Lithuania, other directly related national and international legal acts, and European Union directives. Most of the information on monitoring facilities, equipment and results is provided by the Environmental Protection Agency.