St. Gertrude's Cathedral (Dutch: Sint-Gertrudiskathedraal) in Utrecht, the Netherlands, is the seat of the Archbishop of Utrecht and the mother church of the Old Catholic Church of the Netherlands (and of the wider Old Catholic Communion).

The current church building was constructed between 1912 and 1914, and was designed by E.G. Wentinck (nl) in Neo-Romanesque style, echoing St. Mary's Church, which formerly stood on the Mariaplaats [nl], very close by.

Underneath these relics there is supposed to be a piece of a rib of St.

It was built in 1634 within a mediaeval house as a clandestine church for the members of the Roman Catholic parish of the Geertekerk (nl) (the original St. Gertrude's Church, now in the possession of the Remonstrants).

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