The Holy Trinity Church (Finnish: Pyhän Kolminaisuuden kirkko, Swedish: Heliga Treenighetskyrkan) is an Orthodox Church located in the Kruununhaka district of Helsinki, on the corner of Unioninkatu and Rauhankatu. The church was built in the neo-classical style in 1826 under the direction of the architect Carl Ludvig Engel, and was dedicated and opened in the following year.