Pirjo is a Finnish female given name. Its nameday is celebrated on the 7th of October. It began to be used in the 1920s, and it reached its peak of popularity in the 1940s and 1950s. As of 2013 there are 34,650 women with this name in Finland.
The name Pirjo originated as a short form of Birgitta and Piritta, Finnish versions of Brigida. A common variant is Pirkko.
Notable people with this name include: