Sinclair Buchanan Ferguson (born 21 February 1948) is a Scottish theologian known in Reformed Christian circles for his teaching, writing, and editorial work.

He then moved back to his native Scotland in 1997, filling the pulpit at St George's-Tron Church, Glasgow, where he served as Assistant Minister to George B. Duncan, succeeding the 20-year ministry of Eric Alexander.

From 25 August 2013, he served as a preacher and elder at St. Peter's Free Church of Scotland in Dundee.

Theology for Ministry: How Doctrine Affects Pastoral Life and Practice includes contributions from Joel Beeke, Ligon Duncan, W. Robert Godfrey, Michael Horton, Douglas Kelly, Robert Letham, Philip Ryken, and Chad Van Dixhoorn.

Ferguson was born and raised in the East End of Glasgow, although his family originated from the north of Scotland.