I draw attention to a group of thinkers in Ireland in the first half of the eighteenth century that made significant contributions to the philosophy of political economy. Loosely organized around the Dublin Philosophical Society founded in 1731, these individuals employed a similar set of assumptions and shared a common interest in the well-being of the Irish people. I focus on Samuel Madden (1686-1765), Arthur Dobbs (1689-1765), and Thomas Prior (1680–1751) and argue for two main theses. First, these Irish thinkers shared a number of commonalities with the English mercantilist thinkers of the eighteenth century, and to the degree that they did, their proposals to aid Ireland and reduce poverty were largely doomed to failure. Second, these Irish thinkers also importantly diverged from typical eighteenth-century mercantilist thinking in several ways. These modifications to mercantilism resulted in large part from the unusual political situation of Ireland (as a nation politically dependent on England) and helped orient their economic thinking along more institutional lines. In particular, the emphasis of the Irish on full employment and on the modification of social as well as political institutions is an early step forward in making political economy more sophisticated.