Petra Olli (born June 5, 1994) is a Finnish freestyle wrestler.
She won the silver medal at the 2015 World Wrestling Championships in the Women's freestyle 58 kg-event.
In March 2016 Olli won her first European Championship gold medal at the Senior-level in Riga, Latvia, defeating Oksana Herhel of Ukraine.
She was the first Finnish woman to win a World gold, defeating Danielle Lappage of Canada in the finals of the 2018 World Wrestling Championships in Budapest, Hungary.Olli missed the 2019 World Wrestling Championships due to health problems.