John Gregorson Campbell (1836 – 22 November 1891) was a Scottish folklorist and Free Church minister at the Tiree and Coll parishes in Argyll, Scotland. An avid collector of traditional stories, he became Secretary to the Ossianic Society of Glasgow University in the mid-1850s. Ill health had prevented him taking up employment as a Minister when he was initially approved to preach by the Presbytery of Glasgow in 1858 and later after he was appointed to Tiree by the Duke of Argyll in 1861, parishioners objected to his manner of preaching.