The Diocese of Pontoise (Latin: Dioecesis Pontisarensis; French: Diocèse de Pontoise) is a Latin Church ecclesiastical territory or diocese of the Catholic Church in France. Erected in 1966, the Diocese of Pontoise was split off from the Diocese of Versailles. The diocese is a suffragan diocese in the ecclesiastical province of the metropolitan Archdiocese of Paris. As of 2021, the diocese had one priest for every 4,488 Catholics.

The first ordinations since its 1966 founding occurred in 2011, when four men were ordained priests for the diocese.

The Church Saint-Maclou became the Diocese of Pontoise's cathedral when the diocese was created in 1966. Exceptionally among French Catholic dioceses, Pontoise owns its own cathedral. Many cathedrals in the country are owned by the French state.

• André Rousset (9 October 1966 – 19 November 1988)
• Thierry Romain Camille Jordan (19 November 1988 – 20 July 1999 Appointed, Archbishop of Reims)
• Hervé Jean Luc Renaudin (30 November 2000 Appointed – 18 January 2003 Died)
• Jean-Yves Riocreux (5 May 2003 – 15 June 2012 (appointed Bishop of Basse-Terre)
• Stanislas Lalanne (31 January 2013 – 4 June 2024)
• Benoît Bertrand (4 June 2024 – )

• (in French) Centre national des Archives de l'Église de France, L’Épiscopat francais depuis 1919, retrieved: 2016-12-24.
• Catholic Hierarchy page
• Official Website page

49°03′N 2°06′E / 49.05°N 2.10°E / 49.05; 2.10