Holy Trinity Cathedral, Orthodox cathedral in Chernihiv, Ukraine

Holy Trinity Cathedral is a Russian Orthodox cathedral in Chernihiv, Ukraine, built in the Ukrainian Baroque style and topped with five domes and a tall bell tower. Its whitewashed facades and rounded forms make it one of the most visible structures on the city skyline.

Construction began on 30 April 1679 under Archbishop Lazar Baranovych, but funds ran short until Hetman Ivan Mazepa became patron in 1688, donating 10,000 gold coins and assigning the mills on the Reta River to the project. The cathedral was consecrated on 20 July 1695. After the monastery was abolished in 1786 it was repeatedly rebuilt, losing its Baroque decor and four side domes, and was restored to its presumed original form in the late 20th century.

The cathedral's name comes from the Holy Trinity, and its consecration in 1695 was tied to the transfer of the wonder-working icon of the Ilyin Mother of God. A portrait of Hetman Ivan Mazepa was once painted at the entrance in the guise of St John the Baptist. Since 2025 it has served as the cathedral of the Chernihiv Eparchy of the Orthodox Church of Ukraine.

The cathedral is an active place of worship, so visitors should dress modestly and keep noise low, especially if a service is taking place. The bell tower and outer grounds are easy to view from the street, making a short stop worthwhile even outside service hours.

In the drum of the cathedral's main dome a fragment of an inscription from Hetman Mazepa's time survives, recording the donations of Lazar Baranovych and Ivan Mazepa toward construction. A portrait of Mazepa painted as St John the Forerunner once stood at the entrance, and a carved inscription naming him as donor on the west porch was erased in 1805.