This study presents an analysis of the relative internationalization of 77 research universities in the United States. Institutions enrolling undergraduate students were selected from the 2003 national report, The Top American Research Universities. Data were collected from publicly available sources for 19 indicators of internationalization pertaining to student characteristics, scholar characteristics, research orientation, curricular content, and organizational support. Data were standardized, weighted by a panel of experts, and summed to yield an overall internationalization index score for each institution. Index scores were then used to rank the 77 institutions. A sensitivity analysis yielded a significant positive correlation (.97, p < .001) between the ranking based on the weighted indicators and a ranking derived from unweighted indicators. (Contains 4 tables.)