This article explores the development of LGBTQ+ terminology in Irish, Welsh, and Scottish Gaelic, highlighting its importance for both language revitalization and LGBTQ+ inclusion. It emphasises the concept of “domain gain”, where minority languages expand into new areas like queer discourse, enabling speakers to express diverse identities authentically. Irish has made notable progress through collaborative efforts between the LGBTQ+ community and official bodies, such as the creation of An Foclóir Aiteach. Welsh benefits from strong institutional support and a comprehensive terminology database. In contrast, Scottish Gaelic lags behind due to limited resources and official recognition, though grassroots initiatives are emerging which are driven by interested and passionate parties. The article argues that inclusive, accurate terminology is essential for minority language speakers to avoid double marginalization and calls for sustained collaboration between communities and institutions. It concludes that a two-way, community-informed approach is vital for effective and lasting terminology development in lesser-used languages.