This Eurydice brief presents the main findings of the Eurydice report Citizenship Education at School in Europe -- 2017, published in October 2017 and produced under the auspices of the European Commission. Data is based on existing regulations and recommendations gathered by the Eurydice Network in 42 education systems, complemented by findings from the academic literature and by interviews with relevant actors at national level. [This report was written with Sogol Noorani and Elin McCallum.]