This article discusses some of the principal policy issues regarding the structure of postsecondary education that are facing Ontario. The discussion is divided into four sections, the first three of which concern particular aspects of the structure of postsecondary education. The first deals with questions pertaining to the appropriate structure of Ontario's public university sector. It focuses particularly upon the mix of institutional types somewhat along the lines of the Carnegie and Maclean's classifications. The second section concerns the role of the community college in regard to the baccalaureate degree and offering courses for degree credit. The third section deals with the role of a heterogeneous group of institutions that the author calls alternative providers of postsecondary education, such as distance and open universities and corporate and proprietary colleges and universities. After discussing these three specific aspects of structure, the fourth section considers mechanisms for determining the appropriate structure for postsecondary education in Ontario. (Contains 45 endnotes.)