| Cathedral of the Holy Cross | |
|---|---|
 The cathedral | |
| Religion | |
| Affiliation | Armenian Apostolic Church |
| Ecclesiastical or organizational status | museum |
| Location | |
| Location | Akdamar Island, Lake Van, Turkey |
  Shown within Turkey | |
| Geographic coordinates | 38°20′25″N 43°02′13″E / 38.3403°N 43.0369°E |
| Architecture | |
| Architect(s) | Manuel |
| Style | Armenian |
| Groundbreaking | 915 |
| Completed | 921 |
The Cathedral of the Holy Cross (Armenian: Սուրբ Խաչ եկեղեցի, romanized: Surp Khachʿ egeghetsʿi, Turkish: Akdamar Kilisesi or Surp Haç Kilisesi) on Aghtamar Island, in Lake Van in eastern Turkey, is a medieval Armenian Apostolic cathedral, built as a palatine church for the kings of Vaspurakan and later serving as the seat of the Catholicosate of Aghtamar.