In this article, a social movement lens is applied to examine the dynamics of an urbanbased language revitalization movement in the Autonomous Community of Galicia (North-western Spain). The potential of Resource Management Theory is explored as a way of systematically analysing the dynamics of urban-based language revitalization movements. It does this by identifying factors which both helped fuel the emergence and growth of this Galician grassroots movement as well as those constraining its potential development. Drawing on in-depth interviews and observations collected over six months of ethnographic fieldwork in one of Galicia's main cities, social movement theory is used to analyse the role of Galician social movement activists as social agents in shaping the success of their language revitalization initiative. We argue that a social movement lens provides a useful analytical toolkit to focus on the grassroots efforts of social agents involved in peripheral ethnolinguistic mobilization in minority language contexts such as Galicia. Ultimately, we aim to show that these social movement revitalization initiatives go beyond language as an object and are centred around language-based struggles which not only address strategy dilemmas but also scaffold social relations and ties among speakers as they mobilize within particular institutional fields.