Trefaldighetskyrkan may refer to: a Swedish word meaning Holy Trinity Church, that sounds similar to the Norwegian word for the same, Trefoldighetskirken.
In Sweden Trinity Church (Karlskrona) (Trefaldighetskyrkan) Trinity Church, Halmstad (Trefaldighetskyrkan) Trinity Church, Kristianstad (Trefaldighetskyrkan)
In Norway Trinity Church (Arendal) (Trefoldighetskirken) Trinity Church (Oslo) (Trefoldighetskirken)