Kaija Siren

Katri (Kaija) Anna-Maija Helena Siren (née Tuominen; October 23, 1920 – January 15, 2001) was a Finnish architect.

She graduated as an architect from the Helsinki University of Technology in 1948.

She and her husband Heikki Siren set up their own architectural office in 1949.

The Sirens worked together as architects their entire life.

The Otaniemi Chapel is noted for its delicate balance between features of Finnish rural architecture and a modernism, influenced by Alvar Aalto's redbrick period of the 1950s.