This chapter traces the transnational translation of the settlement house model from the UK and the USA to France and from there to Portugal. The French settlement houses, maisons sociales, that emerged at the end of the 19th Century were influenced by social Catholicism and feminism. They also shared commonalities with, and exhibited divergences from the UK and US settlement house models. While residence, research and engagement in professional training were common, research in the maisons sociales was, unlike in the USA, not a means to further social policies but rather to enhance scientific knowledge. In the mid-1930s, the settlement house model was adopted in Portugal under the aegis of the single-party regime of the Estado Novo. Of the two organisations that engaged in the establishment of settlement houses in Portugal in the following decades, the Institute of Social Work in Lisbon (ISS) was strongly influenced by the French maisons sociales and by social Catholicism.