Attitudes toward older people can influence how they are treated and their cognitive and physical health. The populations of the United States and many other countries have become more ethnically diverse, and are aging. Yet little research examines how ethnic diversity affects attitudes toward older people. Our study addresses this research gap. Using the Aging Semantic Differential, 592 university students expressed their attitudes toward older African-American, Hispanic, and White women and men. Repeated measures analysis of variance examined attitude differences by participant ethnicity and gender, and by the ethnicity and gender of evaluated individuals. Both African-American and White students had more positive attitudes toward older women and men of their own ethnic group. Participants had more positive attitudes toward older women than they did toward older men. Findings suggest in-group favoritism, and the usefulness of training those in service industries and public service to treat older individuals equitably. (Contains 3 tables and 1 figure.)