Policy institutes, or think tanks, have become increasingly visible on the political landscape. However, their policy role has varied in different countries. This article seeks to explain why, compared to think tanks in the United States, Canadian institutes have maintained a relatively modest presence in the policy-making community. Although many Canadian think tanks have made concerted efforts to replicate the strategies of their American counterparts, they have had far less success employing them in an effective and meaningful manner. While many American think tanks have both the resources and the opportunities to convey ideas to policy makers, Canadian organizations must overcome institutional, cultural and economic barriers before they can play a decisive role in policy-making circles. This article also makes reference to the experiences of think tanks in some parliamentary systems, notably Great Britain, to demonstrate that although these barriers are formidable and need to be addressed in some detail, they are not insurmountable.