[Excerpt form authors]Ontario does not educate sufficient nurses to avoid a serious shortage in the future. Therefore, it is essential that planners understand the importance of internationally educated nurses (IENs) as a supply source. This report builds on Report Number 3 in the Health Human Resource series (Baumann, Blythe, Rheaume, & McIntosh, 2006) and answers three questions: What are the characteristics of the Ontario IEN workforce? What factors are likely to influence IEN supply in the future? What are the implications of IEN migration for policy making and workforce planning?