The Union Church of Istanbul
The Union Church of Istanbul (UCI) is an international, Protestant and evangelical church, in Istanbul.The church began around the year 1831 when families of the American Board of Commissioners for Foreign Missions arrived in Constantinople, making it the oldest existing Protestant church in the country of Türkiye.
The church has been meeting for Sunday services in the Dutch Chapel since 1857, which is located on the grounds of the Consulate General of the Netherlands in Istanbul (formerly the Embassy). The chapel is only a few minutes walk on İstiklal Avenue towards Taksim Square from the Şişhane Metro station.