The Holy Trinity Orthodox Cathedral in Lutsk, Ukraine, forms part of the Bernardine Monastery and Church. It is located on Theatre Square in the center of the city. The monastery was built in 1721. The church, designed by architect Paweł Giżycki, was completed in 1789. Removed from ownership of the Bernardine monks in the second half of the 19th century, the complex of buildings was donated to the Orthodox community of Lutsk.