#1 John David Logan, b. 1961, is a playwright who has also written a large number of screenplays.
#2 John Logan 1923-1987 is an American poet.
#3 John R. Logan 1946- is the author of Urban China in Transition.
#4 John Logan 1748-1788 was the author of Poems : by the Rev. Mr. Logan, one of the Ministers of Leith.