The Cathedral of the Holy Trinity (Serbian: Саборна Црква Свете Тројице, romanized: Saborna Crkva Svete Trojice) is a Serbian Orthodox cathedral church in Mostar, Bosnia and Herzegovina.

It served as the seat of the Eparchy of Zahumlje and Herzegovina from 1873 until its destruction during the siege of Mostar in 1992.

The church was the work of the prominent architect Andrey Damyanov.

It was built between 1863 and 1873.

Ever since the reconstruction, the church was targeted by vandals and thieves motivated by prejudice and hostility.