Frans Reima Ilmari Pietilä was a Finnish architect and theorist. He did most of his work together with his wife Raili Pietilä ; after 1963 all their works were officially attributed to "Raili and Reima Pietilä". Reima Pietilä was a professor of architecture at the University of Oulu from 1973 to 1979.

Ida Helmi Tuulikki Pietilä was an American-born Finnish graphic artist and professor. Pietilä is considered one of Finland's most influential graphic artists, with her work being shown in multiple art exhibitions. She worked as a teacher at the Academy of Fine Arts, Helsinki, and later trained graphic artists and wrote multiple books about graphic arts.