Raili Pietila (Raili Inkeri Marjatta Paatelainen, born 15 August 1926) was a Finnish architect. She did most of her work together with her husband Frans Reima Pietila (25 August 1923 - 26 August 1993); indeed, after 1963 all their works were officially attributed to "Raili and Reima Pietila".

Raili Paatelainen graduated in architecture 1956 also at the Helsinki University of Technology. In 1949-1951 she worked for architect and town planner Olli Kivinen and 1959-1960 for architect Olaf Kuttner. Reima and Raili commenced their collaboration in 1960 creating the office Reima Pietila and Raili Paatelainen, renamed in 1975 to Raili and Reima Pietila architects. Reima Pietila and Raili Paatelainen were married in 1963. Their daughter and only child Annukka Pietila (born 1963), is also a qualified architect.

A major exhibition of the work of Reima and Raili Pietila was held in 2008 at the Museum of Finnish Architecture in Helsinki, titled Raili and Reima Pietila. Challenging Modern Architecture.

Raili and Reima Pietila designed a summer cottage for Reima's sister, the artist Tuulikki Pietila. The famous summer cottage of Tove Jansson and Tuulikki Pietila is situated on the remote archipelago island of Klovharu. The site was the inspiration for Moomin characters.