When you think of Orthodox churches, Helsinki probably doesn’t come to mind. And yet, one of the city’s most recognisable landmarks is just that – Orthodox Uspenski Cathedral of Helsinki built of red brick, crowned with green domes and golden crosses, quietly overlooking the harbour from a nearby hill. Its presence might seem unusual in a country shaped by Lutheran tradition, but the building has been here for over 150 years, a remnant of a time when Finland’s political and religious landscape looked quite different. The interior follows the structure of Orthodox liturgy: with an iconostasis separating the altar from the nave, and a design that draws the eye upward, toward domes and icons.

Orthodox Uspenski Cathedral of Helsinki, Finland | Ortodoksinen Uspenskin katedraali, Helsinki, Suomi | 正教会ウスペンスキー大聖堂, ヘルシンキ, フィンランド | 乌斯彭斯基东正教大教堂, 赫尔辛基, 芬兰 | 우스펜스키 대성당, 헬싱키, 핀란드 | Catedral Ortodoxa de Uspenski, Helsinki, Finlandia | Cathédrale orthodoxe Ouspenski, Helsinki, Finlande | Orthodoxe Uspenski-Kathedrale, Helsinki, Finnland | Katedra Prawosławna Uspieńska, Helsinki, Finlandia

So far on this blog, I’ve shown the interior of only one Orthodox church (Suprasl Monastery), though in recent years I’ve managed to photograph several others. It is time to bridge this gap.

Eastern Orthodoxy is a branch of Christianity. The official split between Catholicism and Orthodoxy, known as the Great Schism, occurred in 1054. At that time, mutual excommunications were issued between the Patriarch of Constantinople, Michael I Cerularius, and the envoys of Pope Leo IX, who led the Western Church from Rome. The schism arose from growing theological, cultural, and political differences between Eastern and Western Christianity. I’ll likely write a more detailed post on this topic soon, as I recently visited Istanbul (formerly Constantinople) and am currently preparing photos of Hagia Sophia, which, before the city became part of the Ottoman Empire, was the premier Orthodox cathedral. 

Interestingly, the church I will show today is located in Finland – a country where Lutheranism is the predominant religion, and Orthodoxy has historically been observed by only a small portion of the population. Lutheranism itself separated from Catholicism in the 16th century as part of the wider Reformation movement, led by the German monk and theologian Martin Luther. The Reformation eventually led to the establishment of the Lutheran Church and other Protestant denominations, which permanently altered Europe’s religious landscape. Today, Finland remains largely Protestant, with approximately 65-70% of Finns belonging to the Evangelical Lutheran Church, though that number is gradually declining as secularization continues. The second-largest faith community is the Orthodox Church, comprising only around 1-2% of the population. The remainder of the population includes those with no religious affiliation and smaller religious communities.

A Symbol of Orthodox Heritage and Russian-Finnish Relations

Still, the Uspenski Cathedral (Uspenskin katedraali) in Helsinki is one of the largest Orthodox churches in Europe. Situated on the Katajanokka peninsula near the harbour and city centre, the cathedral is built of red brick and features distinctive green domes and golden crosses. At the centre of its interior, we will find the iconostasis, a distinctive feature in all Orthodox churches. This icon-covered wall separates the nave (the space for worshippers) from the sanctuary, where the altar is located. In the central part of the iconostasis are the so-called Holy Doors, which lead directly to the altar located behind them (in the photo, look at the golden cross on the iconostasis). These doors are the holiest part of the iconostasis and are opened only at specific moments in the liturgy, after which they are closed again.

The name Uspenski comes from the Russian and Church Slavonic word Uspenie (Успение), which means Dormition or Falling Asleep of the Mother of God. Essentially, it’s a cathedral dedicated to the Dormition of the Virgin Mary. In Catholic tradition, this event is referred to as the Assumption of the Virgin Mary, a dogma formally declared in 1950 by Pope Pius XII, which teaches that Mary was taken up into heaven, body and soul, at the end of her earthly life. Catholicism thus places emphasis on Mary’s physical ascent into heaven rather than on her falling asleep. By contrast, in Orthodox tradition, the Dormition focuses on Mary’s peaceful transition from earthly life to eternal life.

Orthodox Uspenski Cathedral of Helsinki, Finland | Ortodoksinen Uspenskin katedraali, Helsinki, Suomi | 正教会ウスペンスキー大聖堂, ヘルシンキ, フィンランド | 乌斯彭斯基东正教大教堂, 赫尔辛基, 芬兰 | 우스펜스키 대성당, 헬싱키, 핀란드 | Catedral Ortodoxa de Uspenski, Helsinki, Finlandia | Cathédrale orthodoxe Ouspenski, Helsinki, Finlande | Orthodoxe Uspenski-Kathedrale, Helsinki, Finnland | Katedra Prawosławna Uspieńska, Helsinki, Finlandia

The Cathedral was built during the reign of Tsar Alexander II, who was known for his relatively supportive stance toward the Finnish people. He was a liberal ruler who advocated for Finland’s autonomy, fostering a period of more harmonious relations between the Grand Duchy of Finland and Russia. His policies were less oppressive, allowing Finns to retain their institutions, language, and culture. Completed in 1868, Uspenski Cathedral symbolised not only the presence of Orthodoxy but also the peaceful ties between Finns and Russians at that time. This situation changed toward the end of the 19th century, however, when the reigns of Tsar Alexander III and Nicholas II brought an era of intense Russification and mounting tensions.

In the 19th century, when Finland was part of the Russian Empire, Orthodox believers comprised as today only a small percentage of Finland’s population – about 1–2%. Lutheranism remained the dominant faith, a legacy from the centuries when Finland was under Swedish rule (until 1809).  With Finland’s incorporation into Russia in 1809, the Orthodox population grew slightly, particularly among Russian officials, soldiers, and merchants who settled in the area. During Russian rule over Finland, particularly in the late 19th century, There were some efforts to promote Orthodoxy among the Finnish population as part of broader Russification policies. While these efforts did not involve forced conversions, they included state support for the Orthodox Church, the construction of new Orthodox churches, and the symbolic elevation of Orthodoxy in public life. Despite these attempts, however, Orthodoxy did not gain significant traction among Finns, who remained predominantly Lutheran and were determined to preserve their distinct culture and religious identity.

The Design 

The Uspenski Cathedral has retained its original design since its completion in 1868 and has not undergone major structural alterations. The cathedral’s design was created by Russian architect Alexey Gornostayev. After Gornostayev’s death, his team completed the project in line with his original vision. Over the years, the cathedral has undergone only minor renovations and conservation work to maintain its condition. Its characteristic brick walls, green domes, and golden crosses have remained unchanged, allowing the cathedral to preserve its authentic architectural style to this day.

When exploring the interiors of Orthodox churches, it’s useful to recognise two main styles of interior design. Icon-dominant churches: in many Slavic and Balkan Orthodox churches, nearly every surface – walls, domes, and ceilings – is densely covered with icons and frescoes of saints and biblical scenes. Architectural elements like columns and arches serve as supports for the iconography and are less emphasised, allowing the sacred images a visual storytelling. Architecture-integrated churches: in contrast, some Orthodox churches, particularly those in the Russian-Byzantine style – like Uspenski Cathedral in Helsinki – or classic Byzantine structures such as Hagia Sophia, balance sacred imagery with architectural splendour. Here, iconography remains important but is often concentrated on the iconostasis and select areas rather than covering every wall. The architecture itself, with its arches, domes, and play of light, becomes a focal point.

Uspenski Cathedral exemplifies this second style, integrating also distinctive Russian features, such as onion-shaped domes symbolising the flame of faith, intricate cornices and arches that frame the space, and a vibrant colour scheme with red brick, green roofs, and golden crosses.

PS. Helsinki also boasts an impressive Lutheran cathedral, known as the Helsinki Cathedral (Helsingin tuomiokirkko). Located in Senate Square and completed in 1852, is one of the most recognisable buildings and symbols of Finland’s capital.