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Concerns for the vulnerable, the poor and marginalised, both human and non-human, are central to the Christian and Muslim religions. This special issue focuses on the one hand on Catholic social thought and practice with regard to care for the poor and care for the earth, and on the other hand on historical and contemporary Islamic social thought and practice. In this introduction, we set the context of the dialogue and of this special issue. At a general level, we emphasise the centrality of love of God and love of neighbour in both Christianity and Islam. We then focus on the Catholic and Sunni traditions. We discuss how each understands the relationship between love of God/love of neighbour and the different organisational structures and practices which express this love. We highlight some commonalities and differences between teachings, organisational structures and historical and social contexts. We conclude by outlining some areas of mutual learning with regard to the centrality of care for the poor and for the earth in both religions.