Due to globalisation and migration, multilingualism has become both a reality and an aim of education systems across Europe, affecting how language education is shaped. To improve the ways in which schools cater for language education in diverse settings, research is required on the potentials of multilingualism in order to design curricula that foster skills in different languages. This paper aims at identifying and explaining research priorities in the field of multilingualism and language education in a cross-national perspective. It draws on data from a survey with 298 expert participants in five European countries (Germany, Italy, the Netherlands, Portugal, Spain) who ranked pre-identified research topics in relation to their perceived urgency. Results show that experts identified 'effectiveness of multilingual support in regular lessons', 'features of multilingual didactics' and 'effectiveness of literacy support in home languages on the development of academic language skills in the majority language' as having the highest research priority overall. However, these results vary across national settings investigated. While the German, Dutch and Portuguese respondents attributed urgency to research on academic language skills, other issues were rated higher in the Spanish and Italian research contexts. The advantages and limitations of conducting cross-national research are also addressed.