In the European context, the past few hundred years have seen different languages—principally the major tongues of various nineteenth-century imperial powers such as English, German, and Russian—occupy positions of high status and prestige, whilst other languages have been forced into lower social and cultural positions. As a means not solely of communication but also of articulating identity and belonging, the potential for language choice and usage to cause disharmony and conflict—whether at the micro or macro level—is evident. Noting that the European Union (EU) and its constituent institutions were premised on the concept that all of the organisation’s official languages are of equal status, this contribution aims to provide an interdisciplinary overview of some of the broader policies and approaches which surround this initiative. Centring particular attention on those official EU languages which at some point in their recent history have been marginalised and/or minoritised, this will be done firstly by outlining the issue of language as a basic right before examining the intersection of language and power, including reference to languages as a tool for peace. Subsequently, focusing on the EU context, linguistic aspects of the international organisations will be presented, as well as salient points concerning EU multilingualism policy and its general implementation. Finally, within the context of promoting greater linguistic harmony, some possible scenarios for potential future EU languages will be introduced and discussed, including the incorporation of the official languages of selected candidate and potential candidate countries in the western Balkans and elsewhere.