Our analysis identifies several factors that shape voluntary civic engagement, from socio- demographic ones such as education and wealth to citizens’ socio-political engagement, their personal sense of efficacy, and their overall trust in their governments. Country contexts are important, as we see wide cross-country differences in levels of volunteerism. Among other aspects, wealthier countries, on average, report less volunteerism, while democracies report more. We have found evidence that confronting unmet needs – whether one’s own or those of others – is a major motivating factor of voluntary engagement. These findings suggest a number of opportunities and entry points for increasing citizen engagement.