This ARC-funded DECRA study (2026-2029) will deliver new evidence to support safer ageing for older migrants in multicultural Australia. Australia has one of the most diverse ageing populations in the world, with one in three older adults born overseas, however older migrants experiencing mistreatment are typically less able to seek help and access formal and informal sources of support. Although older adult mistreatment occurs in all contexts and cultures, migration processes and visa regimes, transnational family dynamics, and cultural and linguistic diversity are each intersecting factors that change and complicate understandings and manifestations of mistreatment and abuse. Unlike gender-based violence, where the distinct experiences and vulnerabilities of migrant women are now well understood, older adult abuse research and practice do not yet adequately address the impacts of transnational migration and migration policy. This is a significant gap in our knowledge that hinders the development of policy responses that are appropriate for our increasingly superdiverse ageing population. This three-year study will address this gap through empirical data collection and consultation with a range of participants, including older migrants, their family, friends and informal networks, service providers and professionals, community members, and policy stakeholders. Findings are expected to clearly articulate the dependencies and risks associated with migration for both new arrivals and long-term residents, and to support more robust definitions of spiritual and cultural abuse, a form of abuse newly identified as a focus of the National Plan.