The Holy Trinity Church (Turkish: Kutsal Üçlü Ermeni Kilisesi, Armenian: Սուրբ Երրորդություն եկեղեցի) or Surp Yerrortut'yun Church is a historical Armenian Apostolic temple in the former Armenian quarter of Sivrihisar in the western Turkish province of Eskişehir.

In 1881, the Holy Trinity Church was rebuilt by the architect Mintes Panoyat under patriarch Nerses II.

The old frescoes and Armenian inscriptions inside the church are almost completely destroyed.

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