Abstract  This paper presents a comparative analysis of giving ethos and behavior in the United States and the United Kingdom, in particular the relationship of giving to civic life. Obvious disparities between the two countries exist when overall levels of giving are considered. In the United States, individual giving as a percentage of gross national or domestic product has consistently hovered around 2% of Gross Domestic Product. By contrast, charitable giving in the United Kingdom has yet to reach 1% of GDP. The paper identifies the differences in giving ethos and behavior in the two countries in relation to the complexity of the differences between the political structures, social attitudes, and the role of charitable giving in the two countries. In particular, the paper postulates a set of models—generosity and altruism—for explaining the differences.