Richard Casey was involved in shaping Australian foreign policy for over four decades. Casey's attitudes, ideas, policies and actions towards the rest of the world are therefore an important part of a Liberal tradition in Australian foreign policy. To examine Casey's place in the Liberal tradition this article explores Casey's positions on the great international issues of two periods: the 1930s and the 1950s. The conclusion of the article is that three key ideas shaped Casey's foreign policy, and therefore also lie at the centre of the Liberal tradition; firstly, a strong attachment to the idea of the English speaking alliance; secondly, a realist perspective on international affairs; and, thirdly, a consistent strand of anti-communism.