The Pro-Cathedral of the Holy Trinity (French: Pro-cathédrale de la Sainte-Trinité; Dutch: Prokathedraal van de Heilige Drievuldigheid) is an Anglican Pro-Cathedral in Ixelles, a municipality of Brussels, Belgium.

The church is located at 29, rue Capitaine Crespel/Kapitein Crespelstraat, near the Avenue Louise/Louizalaan.

The Pro-Cathedral of the Holy Trinity in Brussels was formed in 1958 by the amalgamation of the congregations of Christ Church and the nearby Church of the Resurrection (now closed).

The cathedral is in Gibraltar, called the Cathedral of the Holy Trinity (and there is a further pro-cathedral in Valletta), but Robert Innes, Bishop in Europe (and former Chancellor (priest-in-charge) of Holy Trinity), is the first bishop to be based in Brussels.

[1] Upon the establishment of Holy Trinity as the Pro-Cathedral in 1980, the Chaplain became the chancellor.