Donald Macpherson Baillie (1887 – 1954) was a Scottish theologian, ecumenist, and parish minister.

Raised in the Calvinist tradition

Calvinism

Calvinism is a Protestant theological system and an approach to the Christian life...

, Baillie studied at Edinburgh University

University of Edinburgh

The University of Edinburgh, founded in 1583, is a public research university located in Edinburgh, the capital of Scotland, and a UNESCO World Heritage Site. The university is deeply embedded in the fabric of the city, with many of the buildings in the historic Old Town belonging to the university...

 and then in Marburg where he was influenced by the theologian Wilhelm Herrmann

Wilhelm Herrmann

Johann Wilhelm Herrmann was a Reformed German theologian.Hermann taught at Halle before becoming professor at Marburg. Influenced by Kant and Ritschl, his theology was in the idealist tradition, seeing God as the power of goodness. Jesus was to be seen as an exemplary man. Even if Jesus never...

. After some time as a Church of Scotland

Church of Scotland

The Church of Scotland, known informally by its Scots language name, the Kirk, is a Presbyterian church, decisively shaped by the Scottish Reformation....

 parish minister, he wrote Faith in God and its Christian Consummation (1927). This led to his appointment as a professor of divinity at St Mary's College

St Mary's College, St Andrews

St Mary's College of the University of St Andrews, in Fife, Scotland - in full, the New College of the Assumption of the Blessed Virgin Mary - was founded in 1538 by Archbishop James Beaton, uncle of Cardinal David Beaton on the site of the pedagogy or St Johns College .St Mary's College was...

, University of St Andrews, where he spent the remainder of his life.

His only other, and more famous, work was God was in Christ (1948) which explored the paradox of grace

Irresistible grace

Irresistible Grace is a doctrine in Christian theology particularly associated with Calvinism, which teaches that the saving grace of God is effectually applied to those whom he has determined to save and, in God's timing, overcomes their resistance to obeying the call of the gospel, bringing...

, and applied it to incarnational theology

Christology

Christology is the field of study within Christian theology which is primarily concerned with the nature and person of Jesus Christ as recorded in the Canonical gospels and the letters of the New Testament. Primary considerations include the relationship of Jesus' nature and person with the nature...

.

He was the brother of Scottish theologian John Baillie (1889-1960).