This article explores the value of social justice as a shared ethical ground for social workers worldwide. Constructions and interpretations of social justice are deeply affected by different perspectives, contested positions and unequal power dynamics. As societies become ever more diversified, these may hinder the centrality of social justice as a core value. Drawing on data collected from participants in a binational interprofessional seminar on social justice in multi-cultural societies, this qualitative study is based on interviews and visual analysis with 16 American and 15 Israeli social workers and social work students. Findings suggest that social justice remains a core value although it is both an organising and disorganising, unifying and dividing concept. The study explores the positive contribution of positionality to help gain a broader understanding of social justice and navigate challenges in implementation, practice and education in diverse and conflicted settings. Practical implications for social work practice and education are discussed.