John Drysdale FRSE (29 April 1718-16 June1788) was twice Moderator of the General Assembly of the Church of Scotland, both in 1773 and in 1784. He was Dean of the Chapel Royal in Scotland 1766 to 1788, and Chaplain in Ordinary to George III. He was brother-in-law to Robert Adam and father-in-law to Andrew Dalzell.