Based on official data on religion, national origin, and other indicators of ethnic origin, Muslim fertility in 13 European countries is higher than that for other women, but in most countries with trend data the differences are diminishing over time. Fertility varies by country of origin of immigrants. Various European survey data show that higher proportions of Muslim women are married and their commitment to traditional family values is greater than among other women. Muslim women are more religious than non-Muslim women and religiousness is directly associated with fertility. Among Muslim women, religiousness and commitment to family values are equally important for fertility, while for non-Muslim women religiousness is much less important.