The main Church of Kotka is the Evangelical Lutheran Cathedral, built in 1898, of red brick in neo-Gothic style, designed by Josef stenbäck. Inside 1560 seats. Spacious building with a height of 54M, with magnificent stained glass window, beautiful patterns on the columns and the amazing carved wooden interior serves as a concert hall to listen to the organ music.

Church organ, with 44 of the register, made Marty Partnerom in Baroque style in the likeness of the organ in Freiberg Cathedral, Germany, was established in 1998. for the centennial of the Church. Altarpiece “the adoration of the Magi”, written by Pekka Halonen, depicts the baby Jesus.

The main Church of Kotka belongs to the diocese of Mikkeli. Visitors are offered guided tours.