Piia Suomalainen (born 9 July 1984) is a Finnish former tennis player.

In her career, Suomalainen won five singles and five doubles titles on the ITF Women's Circuit.

On 10 October 2011, she reached her best singles ranking of world No.

Since her debut for the Finland Fed Cup team in 2002, Suomalainen has a 37–34 record in Fed Cup competition.

This biographical article relating to Finnish tennis is a stub.