John Hay of Renfield (1566–1627) was a Scottish minister who served as Constant Moderator of the General Assembly of the Church of Scotland in from 1605 (or 1615) to 1627.
His paternal grandfather was William Hay, fourth Laird of Talla in Tweedsmuir.
His paternal uncle, George Hay of Rathven, was Moderator in 1571.
On John's death Agnes married Matthew Wallace of Dundonald.
Her daughter Jean married Matthew's son, James Wallace of Dundonald.