This study proposes, from a cross-national perspective, a model of environmental citizenship that includes predictors at the individual and contextual levels. The model is based on multiple theoretical considerations from environmental sociology, media studies, and economics. The study, based on secondary data, reports that at the individual level, media use, environmental concern, and postmaterialism positively predict environmental citizenship. However, the data also allow to test whether the effects of these variables vary depending on social and environmental contexts. Beyond the individual level, results show that, overall, the effect of environmental concern is stronger in countries with better environment quality. The results also show that economic development at the country level positively explains a stronger effect of postmaterialism on environmental citizenship than in less developed countries. The study shows that environmental citizenship is stronger in countries with lower levels of environment quality, and in countries with less developed media systems.