Gavin D'Costa (born 1958) is the Emeritus Professor of Catholic Theology at the University of Bristol. His academic career at Bristol began in 1993. D'Costa was appointed a visiting professor of Inter-religious Dialogue at the Pontifical University of Saint Thomas Aquinas, Rome.

D'Costa was born in Kenya and immigrated to Great Britain in 1968. He was educated at Goldington Junior School in Bedford, and afterwards at Bedford Modern School. He went on to study English & Theology at the University of Birmingham under the theologian John Hick. After graduating, he studied at the University of Cambridge before teaching at the West London Institute, Bristol University, and at the Pontifical University of Saint Thomas Aquinas, Rome. His research interests include systematic theology, theology of interreligious dialogue, Roman Catholic modern theology, the Second Vatican Council and Jewish-Catholic dialogue.

In 1998, he was a visiting professor at Rome's Gregorian University of the Jesuit Order. In 2020–2021 he was a visiting professor at Rome's Angelicum, Pontifical University of the Dominican Order. He has also worked on the Church of England and Roman Catholic Committees on Other Faiths, advising these communities on theological issues. He also advises the Pontifical Council for Other Faiths, Vatican City.

D'Costa has published his poetry in a joint collection, Making Nothing Happen (2013), and has had his poetry set to music by composer John Pickard.

D’Costa’s first book, Theology and Religious Pluralism (1986) followed Alan Race and developed the threefold typology of pluralism, inclusivism, and exclusivism regarding the Christian theological approach to other religions. He examined the work of key representatives of each of these positions: John Hick as a pluralist, Karl Rahner as an inclusivist, and Hendrik Kraemer as an exclusivist. D’Costa defended Rahner's inclusivism that held to the universal love of God for all people as well as the necessity of Christ's grace for salvation. The combination of these two axioms allowed that other religions could be, in principle, mediations of the saving grace of Jesus Christ. D’Costa argues that pluralism only emphasized the universal love of God and that exclusivism only emphasizes the necessity of belief in Christ for salvation.

D’Costa has been a persistent critic of John Hick’s pluralism approach. In his doctoral work, John Hick’s Theology of Religions (1987), he tried to show that Hick’s claim that all religions lead to the same divine reality was problematic on three counts. First, it went against the orthodox claims of Christian theology. Second, Hick’s claim could only be sustained if all religions were re-interpreted, thus requiring that all religions conform to his demand that they abandon ultimate ontological convictions. Third, D’Costa tried to show that pluralism was internally incoherent, because it makes a privileged claim for its own position as the greatest truth.

In his next work, The Meeting of Religions and the Trinity (2000), D'Costa shifts his attention towards exclusivism. He argues that there is no such position as pluralism; pluralism is technically a disguised form of exclusivism, either religious (as in the case of the Dalai Lama, in his study of modern Tibetan Buddhism, or in the case of Sarvapelli Radhakrishnan, the modern proponent of Advaita neo-Hinduism), or a form of modernity (in the case of Hick and the Roman Catholic theologian Paul F. Knitter, and the Jewish theologian, Dan Cohn-Sherbok). Hence, these positions advocate that all religions are equal, but actually have an explicitly religious exclusivism (in the case of the Dalai Lama, there is no liberation until one has become a De Lug Buddhist monk), but one has endless lifetimes to achieve this; likewise for Radhakrishnan, but in this case (a non-dual Advaitin experience of moksha is required for final release from the cycle of birth and death), or a secular modern exclusivism (an ethical rule, that derives from Kant and stands in judgment upon all religions). D’Costa defends a trinitarian approach to other religions that refuses to see them as equal or provisional/imperfect forms of revelation or salvific means; nevertheless, he acknowledges the grace of God operative within these traditions in a fragmentary and inchoate manner. He relies heavily on the work of Alasdair MacIntyre and John Milbank.

D'Costa develops this position in his Theology in the Public Square (2005) in relation to the importance of Christian theology taking a decisive public stance and developing a public voice, the latter mainly through the idea of a Christian University.