ABSTRACT El Salvador’s 2017 national metal mining ban and contentious 2021 water law seemingly represent distinct cases of social movement victory and failure. However, this study deploys relational methodologies to examine how El Salvador’s anti-metal mining and water justice movements emerged together, became partially separated, and remained thoroughly entangled. The concept of social movement entanglement builds on and extends dominant notions of relationality in social movement studies by emphasizing processes of intra-relation, mutual constitution and becoming-with. Rather than study how separate movements interact, investigating entanglement highlights how social movements become separated and remain entangled through acts of material and discursive politics. Examining the entangled origins, mobilizations, and outcomes of El Salvador’s anti-metal mining and water justice movements shows how these movements were neither the same nor distinct. Salvadorans bearing the brunt of water injustices lived these movements as one struggle. However, to pass the historic metal mining ban required anti-mining activists to distance their social movement goals and discourses from the more politically contentious and legally complex water law. Vitally, the strategic separation of these movements led to their further entanglement, as the historic ban informed, reinforced, and legitimized transformations within the water justice movement. From their origins to their evolving presents, El Salvador’s water and mining politics have remained entangled. Such entanglements implicate social movement theory, methodology and praxis in El Salvador and beyond and center the power-relations that shape what counts as social movement success and failure, and whose interests and environments are worth fighting for.