This article analyzes an important discretionary power of the Supreme Court of Canada, the ability to award costs. With the use of an original data set, we explore trends in costs awarding in public interest litigation at the Supreme Court from 1970 to 2012. Our findings suggest that, over time, the Court has tended to favour nongovernment parties over government parties where the former are less likely to pay costs when they lose and more likely to receive costs when they win. In these cases, costs orders were more likely to benefit public interest litigants, such as nongovernmental organizations, than individual litigants and businesses. Together, these findings suggest a sensitivity to access to justice concerns when making costs orders, though some may argue that this sensitivity by the Court does not extend far enough.