Tuuli Pauliina Petäjä-Sirén (born 9 November 1983 in Espoo) is a Finnish windsurfer.

She won a silver medal at the 2012 Summer Olympics in the women's RS:X.

[2][3] At the opening ceremony of the 2016 Summer Olympics Petäjä-Sirén was chosen to carry the Finnish flag.

[5] At the 2020 Summer Olympics, she competed once again in the women's RS:X, and finished 14th.

This biographical article related to sailing in Finland is a stub.