European countries exhibit significant differences in employment rates of adult males. Differences in average labor-leisure preferences, determined by cultural values that vary across countries, can be responsible for part of these differences. However, differences in labor market institutions, productivity, and skills of the labor force are also crucial factors and likely correlated with preferences. In this paper we use variation among first- and second-generation European migrants to isolate the effect of culturally determined labor-leisure preferences on individual employment rates. If migrants maintain some of their country of origin labor-leisure preferences as they move to different labor market conditions, we can separate the impact of these culturally determined preferences from the effect of other factors. We find that country-specific labor-leisure preferences explain about 24% of the top-bottom variation in employment rates across European countries.