The Grote of Sint-Gertrudiskerk (Great or Saint Gertrudis Church) is a huge late Gothic hall church, which is quite unusual for this part of the Netherlands. The church was built at the end of the 15th century (1480) by adding a choir to its single-nave predecessor. Shortly afterwards a transept was also built. Around 1515, work began on replacing the old one-aisled cruciform with the present three-aisled hall church. Due to a war, work was only restarted in 1523.

The nave was never completed and in 1615 was closed by a wooden wall - which remained until the restoration of 1939/1951 - leaving the still unfinished tower standing at some distance in front of the church. In 1613 a crown with an onion-shaped dome was added to the tower. A sacristy was built between the choir and the transept (main image), which also served as the Latin School of Workum.

The church, sacristy and tower are designated national Dutch monuments.
The Grote of Sint-Gertrudiskerk is still used for services by the Protestant church of Workum. .