Thomas Main (1816–1881) was a Scottish minister who served as Moderator of the General Assembly for the Free Church of Scotland 1880–81.

[1] In the controversy which led to the Disruption he took an active, and, in fact, a leading part, and did considerable service in the cause of the Free Church movement, both in Kilmarnock and elsewhere.

[3] Returning from the Continent in 1880, in order to prepare for his duties as Moderator of the Free Church Assembly, he heard Dean Stanley preach in St. Margaret's, Westminster.

As Moderator of the General Assembly in 1880, it fell to him to admonish and to counsel Professor Robertson Smith, on then being restored to his chair, which he did in a Christian and dignified manner.

[4] Dr. Main seems to have been an earnest and energetic minister, strongly attached to the Free Church, but tolerant and desirous of being fair to others.

[1] Due to his unexpected death the post as minister of St Mary's was not filled until 1883 (by Rev George Davidson).