Despite the importance of labor force status to the well-being of older women in developing and developed nations, retirement of females has not been studied cross-nationally. This article first presents hypotheses concerning the effects of (1) industrial development, (2) social security growth, (3) sex stratification, and (4) family structure and fertility on cross-national patterns of female retirement. It then argues that industrial development interacts with the variables specified by the other hypotheses in determining female retirement, Longitudinal, aggregate data for 93 nations in 1960, 1965, and 1970 are used to calculate rates of withdrawal of females from the labor force during old age and to test the arguments. The results show substantial female retirement that varies systematically with the economic and social characteristics of the nations studied. As predicted, the effects of pensions, family size, and sexual equality on female retirement increase with the level of industrial development. ...