Tuomo Mannermaa (29 September 1937 – 19 January 2015) was professor emeritus of ecumenical theology at University of Helsinki.
He is known especially for his theological criticism of the Leuenberg Concord and his research on the relationship between justification and theosis in the theology of Martin Luther.
His initiating and furthering this research caused him to be regarded as the father of "The New Finnish Interpretation of Luther" or "the Finnish School of Tuomo Mannermaa".