Kristian Gullichsen (born 29 September 1932, Helsinki) is a Finnish architect. The son of Harry and Maire Gullichsen he was born into a family of industrialists, designers and artists. Kristian Gullichsen has been a member of the board of governors of the Alvar Aalto Academy and the committee of the Alvar Aalto Symposium. From 1988 to 1993 he held the title of Finnish State Artist Professor.
Kristian Gullichsen has three sons and two daughters, one of the sons is the artist Alvar Gullichsen (born 1961). Gullichsen has been married twice; his second wife is architect Kirsi Gullichsen (née Parkkinen) (born 1964).
The Gullichsen family home was the world-famous Villa Mairea (1938–39) in Noormarkku, designed by Alvar Aalto, one of the seminal houses of 20th century modernist architecture. Kristian was seven years old when his family moved into the house in August 1939. The family was close friends of the Aalto family, and Aalto was responsible for designing the company factories and communities, as part of the company ideology of enculturation. Kristian played with the Aalto children and did odd jobs in the Aalto architects' office.
Kristian Gullichsen studied architecture at Helsinki University of Technology, qualifying as an architect in 1960, after which he returned to the Aalto office to work as an assistant architect, before founding his own office in 1961. From 1965 to 1967 he was also Head of the Exhibitions Office of the Museum of Finnish Architecture, Helsinki. In his early career he did a number of joint works with other architects such as Kirmo Mikkola and Juhani Pallasmaa. Of such projects the most memorable historically was the so-called Moduli 225 house (1969-1971), an industrially produced prefabricated summer house, built in timber, steel and glass, influenced by Japanese house design, the teachings of his mentor, Finnish architect and professor, Aulis Blomstedt and the minimalist houses of Mies van der Rohe. Seventy of the houses were built, but few remain today because they could not withstand the Finnish climate.