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. She was chosen as athlete of the year in Finland in 2012.

At the opening ceremony of the 2016 Summer Olympics Petäjä-Sirén was chosen to carry the Finnish flag. She finished 10th in the women's RS:X. At the 2020 Summer Olympics, she competed once again in the women's RS:X, and finished 14th.

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