This study examines teachers’ views concerning multilingualism in Finnish-language and Swedish-language schools in Finland. Using the concepts of linguistically responsive teaching and sustainable translanguaging, the following research questions were posed: 1. How do teachers in Finnish-language and Swedish-language schools perceive multilingualism as reflected in their language use? 2. How do teachers in Finnish-language and Swedish-language schools perceive multilingualism as reflected in their guidance of the students’ language use? The data were collected through an online survey (N = 2 865) conducted in schools located in 291 municipalities across Finland, covering the entire country. Participants included primary school teachers, subject teachers, and special needs teachers. Almost a third of the participating schools reported no students with home languages other than Finnish, Swedish, or Saami. Both quantitative and qualitative methods were adopted. The results reveal that the teachers in Finnish-language schools relate the concept of linguistic diversity to all languages, whereas the teachers in Swedish-language schools often embrace the national languages within that concept. Furthermore, the results confirm the outcomes of previous research, reporting that Swedish-language schools have a dual role: to safeguard the use of the school language, which has a minority position in the Finnish society, and to acknowledge growing linguistic diversity. Teachers in both school types partially embrace multilingualism but need further support to implement linguistically responsive teaching. The results also suggest that to help teachers develop strategies for linguistically responsive teaching, the connection between teachers’ orientations and pedagogical knowledge needs to be further emphasised.