In this paper we attempt to assess how labor unions affect cross-national variation in life satisfaction. We argue that cross-national differences in the extent of labor organization play a significant role in determining why citizens in some nations express greater subjective satisfaction with life than others. We examine this proposition using data on nations that cover the political and economic spectrum. To anticipate our findings, we show that individual union membership has a consistent positive effect on individual well-being. Our main focus, though, is the effects of the national level of union density on the general, overall level of satisfaction within a country, considering both union members and nonmembers. We find that union density is strongly associated with the general level of well-being but that this effect is conditioned, as we expect, by the level of democracy: in democratic countries, union density produces greater levels of life satisfaction, while in highly authoritarian settings, it appears to reduce satisfaction. In each case, these effects obtain for members and nonmembers alike, thus highlighting the importance of labor unions for the general, overall level of quality of life across nations. © 2012 UALE.