William Terrence McGrattan

William Terrence McGrattan (born 19 September 1956) is the eighth and current Bishop of the Diocese of Calgary. McGrattan was previously the Bishop of the Diocese of Peterborough. Before being appointed to that post, he was an auxiliary bishop for the Archdiocese of Toronto and titular bishop of Furnos Minor. He was born in London, Ontario, Canada.

McGrattan was ordained to the priesthood on 2 May 1987 for the Diocese of London by Bishop John Michael Sherlock.On 6 November 2009 McGrattan was appointed by Pope Benedict XVI as one of two new auxiliary bishops for the Archdiocese of Toronto along with Bishop Nguyen. McGrattan was ordained Titular Bishop of Furnos Minor on 12 January 2010 at St. Peter's Cathedral Basilica in London, Ontario.

As Auxiliary Bishop of Toronto, McGrattan had responsibility for the Central Region that includes seventy-one parishes in the central part of the City of Toronto. In addition to his regional responsibilities, he was Vicar for Lay Movements and Associations, Vicar for Ethnic Communities, and the liaison bishop for the Catholic School Chaplains of Ontario, the Catholic Association of Religious and Family Life Educators of Ontario, the Catholic Health Association of Ontario, and the Catholic Health Alliance of Canada.

• 2 May 1987: Ordained a priest in the Diocese of London
• 6 November 2009: Appointed Auxiliary Bishop for the Archdiocese of Toronto
• 6 November 2009: Appointed Titular Bishop of Furnos Minor
• 12 January 2010: Ordained Titular Bishop of Furnos Minor
• 8 April 2014: Appointed Bishop of Peterborough, Ontario, Canada
• 4 January 2017: Appointed Bishop of Calgary, Alberta, Canada

• 1992: S.T.L. Licentiate in Fundamental Moral Theology, Pontificia Universita Gregoriana, Rome
• 1987: MDiv. Master of Divinity, St. Peter's Seminary – The University of Western Ontario, London, Ontario, Canada
• 1979: BESc Bachelor of Engineering Science in Chemical Engineering, The University of Western Ontario, London, Ontario, Canada

• 1997–2009: Associate Professor, St. Peter's Seminary, London, Ontario
  • Fundamental Moral Theology, Sacramental Theology, Religious Studies
• 1994–1997: Assistant Professor, St. Peter's Seminary, London, Ontario
  • Fundamental Moral Theology, Sacramental Theology, Religious Studies
• 1992–1994: Lecturer, St. Peter's Seminary, London, Ontario
  • Fundamental Moral Theology, Religious Studies
• 1987–1990: Associate Pastor, St. Joseph's Parish, Chatham, Ontario
• 1982–1987: Research Assistant, The University of Western Ontario, London, Ontario
• 1979–1982: Chemical Engineer (P.Eng.), Polysar Limited, Sarnia, Ontario