The Nidaros Cathedral Choir
is Nidaros Cathedral's own chamber choir with around 40 members. The choir's repertoire consists primarily of church music from the last 500 years, as well as world premieres of works by local and national composers. On the CD Nidaros (2010), Nidaros Cathedral Choir has recorded excerpts from music written especially for the choir, and in 2014 the CD recording of Torbjørn Dyrud's "Out of Darkness" was nominated for a Grammy for Best Choral Performance. Nidaros Cathedral Choir emphasises the importance of maintaining the highest musical standards in innovative performances, productions of major works and participation in Nidaros Cathedral's worship life. The choir regularly collaborates with internationally recognised soloists, conductors and musicians, and represents Trondheim and Nidaros Cathedral regionally, nationally and internationally.

Cathedral Cantor Karen Haugom Olsen has been the choir's permanent conductor since 2016. In 2020, the choir was also awarded "production and operating support for choirs at a particularly high level" by the Ministry of Culture.

Karen Haugom Olsen
trained as a cantor at the Norwegian Academy of Music. She completed a master's degree in solo organ playing with Jon Laukvik at the Musikhochschule Stuttgart in 2005. From 2005 to 2014, she was employed as a cantor at Nordstrand Church in Oslo, where she was responsible for all musical activities. In the autumn of 2014, Karen Haugom Olsen completed her master's degree in conducting at the Norwegian Academy of Music with Professor Grete Pedersen. From 2012-2014 she was also Pedersen's assistant in the Norwegian Soloist Choir. In 2014-2015 she was employed as a lecturer in conducting at the University of Erfurt, with the main responsibility for the chamber choir and conducting teaching. Karen Haugom Olsen took up the position of Cathedral Cantor at Nidaros Cathedral in 2016.