The role of political parties in foreign policy is gaining increasing attention. Nonetheless, despite an extraordinary interest in ‘populism’, the foreign policy of populist parties has rarely been investigated. This article provides an innovative theoretical framework, applying it on a rare example of a ‘pure’ populist party: Italy’s Five Star Movement. How has Five Star Movement positioned on Italian contribution to military operations abroad? What does such positioning say about its ideological leaning? In order to address such questions, the article analyses Five Star Movement’s MPs’ votes and speeches on foreign policy during its first term in Parliament (2013–2018). We find that, notwithstanding some ambiguities, the Movement’s stance has been mostly pacifist and humanitarian, resembling more a ‘left-libertarian populist party’ than a ‘sovereigntist far-right one’. Through these findings, the article contributes to the debate on populist parties and foreign policy in Europe, clarifying also the elusive ideological leaning of the Five Star Movement.