The Saint Sofia Church (Bulgarian: църква „Света София“, tsarkva "Sveta Sofia", "Church of Holy Wisdom") is the oldest church in the Bulgarian capital Sofia, dating to the fourth century. In the predecessor building took place the Council of Serdica held most probably in 343 and attended by 316 bishops. In the 14th century, the church gave its name to the city, previously known as Serdika (Сердика).

The Saint Sofia Church was built on the site of several earlier churches from the fourth century, and places of worship dating back to the days when it was the necropolis of the Roman town of Serdica. In the second century, it was the location of a Roman theatre. Other churches were built and destroyed during conflicts with Goths, Huns and others for the next few centuries. As a contemporary structure of the Hagia Sophia church in Constantinople, the Saint Sofia Church, with the cross design of its current basilica, two towers and one tower-cupola, is believed to have been built during the reign of Byzantine Emperor Justinian I (527–565).

The Saint Sofia Church came under control of a metropolitan bishop in the Second Bulgarian Empire (12th to 14th centuries). Notably, the capital of the country Sofia was named after the church in the 14th century. The 12th-century frescoes were destroyed, replaced with minarets, and the church was converted to a mosque in the 16th century during Ottoman Bulgaria. The mosque was abandoned in the 19th century, because two earthquakes destroyed one of the minarets. Restoration of the basilica began about 1926 by Bogdan Filov and was completed about 1935.

The Saint Sofia Church is now one of the most valuable pieces of Early Christian architecture in Southeastern Europe. The present building is a cross basilica with three altars. The floor of the church is covered with complex Early Christian ornamental or flora and fauna-themed mosaics. The Saint Sofia Church stands in the middle of an ancient necropolis and many tombs have been unearthed both under and near the church. Some of the tombs even feature frescoes.

Because Saint Sophia represents Holy Wisdom, icons within the church depict Sophia as Christ Emmanuel, a young figure of Christ seated on a rainbow. The church also displays icons of historical saints, including St. George and St. Vladimir.

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  Nave
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  Façade view in 1878
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  View of the church c. 1915
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  Plan of the church

• List of churches in Sofia
• History of Roman and Byzantine domes

• "Света София". Българска енциклопедия А-Я (in Bulgarian). БАН, Труд, Сирма. 2002. ISBN 954-8104-08-3. OCLC 163361648.
• The Church of St. Sofia / Църквата "Св. София"
• Historical photographs of the Saint Sophia Church
• 3D Model of the Church