Guy Étienne Germain Gaucher (5 March 1930 – 3 July 2014) was a French Catholic Discalced Carmelite bishop and theologian. He was an international authority on the life and writings of Thérèse of Lisieux.
Born in Tournan-en-Brie, he was ordained a priest on the 17 March 1963 and made his religious profession into the order of Discalced Carmelites on 3 October 1968. He was named Bishop of Meaux, 27 August 1986, consecrated on the 19 October 1986 by the archbishop of Paris, cardinal Jean-Marie Lustiger. A few months later, 7 May 1987, he was named auxiliary bishop of Bayeux-Lisieux in residence at Lisieux. He remained in this post until the 1 July 2005 at which time he retired having reached the age limit.
At first a specialist in the writings of Georges Bernanos, he subsequently devoted his attention to the personality and writings of Thérèse of Lisieux. Amongst his many editorial works, he notably participated in the centenary Edition of the works of Thérèse. 
Gaucher died on the 3 July 2014 at the age of 84.
- Gaucher, Guy. The Story of a Life: St. Thérèse of Lisieux. San Francisco: Harper & Row, 1987. ISBN 978-0-06-063095-9 Over copies in US libraries, according to WorldCat
- Review, Catholic Historical Review, Apr., 1989, vol. 75, no. 2, p. 304-305
- Gaucher, Guy. John and Thérèse: Flames of Love : the Influence of St. John of the Cross in the Life and Writings of St. Thérèse of Lisieux. Staten Island, N.Y.: Alba House, 1999.
- Thérèse, Guy Gaucher, and Aletheia Kane. The Prayers of Saint Thérèse of Lisieux: The Act of Oblation. Washington, DC: ICS Publications, 1997.
- Gaucher, Guy. The Passion of Thérèse of Lisieux: 4 April - 30 September 1897. New York: Crossroad, 1990.
- Guy Etienne Germain Gaucher
- Discorso Di Giovanni Paolo II Ai Pellegrini Convenuti Per La Proclamazione A Dottore Della Chiesa Di Santa Teresa Di Lisieux , 
- Le Figaro 17/10/2008
- "Le décès de Mgr Guy Gaucher, ancien évêque auxiliaire de Lisieux et évêque de Meaux". Radio Notre Dame. 4 July 2014.
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