The purpose of this study is to describe the Swedish Centre Party’s defense policy between the years 1912-2015. and try to outline potential ideological changes in their politics during the same period. An ideology analysis is employed for the purpose. The analysis is carried out by a method based on ideological ideal types, to which the Swedish Centre Party’s defense policy through history are compared to. The ideological ideal types ”liberalism” and ”realism” are aiming to describe the international defense policy, whilst the ideal types ”doves” and ”hawks” are aiming to describe the national defense policy. The use of ideal types, as it is done in this study, is to be seen as a way to bridge the gap between everyday policies and more abstract ideology. The result of this study shows that not only has an ideological change taken place in the Swedish Centre Party’s defense policy during the course of history; three major changes are identified and described. The study also shows that the Swedish Centre Party has made an ideological travel from being isolationistic pacifists pre-World War I to approaching a more liberal hawk-influenced defense policy in the 21th Century.