In February 2019, Wierer was the third biathlete (after French Martin Fourcade and Marie Dorin Habert) to achieve a victory in every biathlon discipline.

At the start of the 2015–16 season, Wierer recorded the first win in her career in the Biathlon World Cup in Östersund and as of the end of 2019-20 season, Wierer has finished on the podium 35 times with 11 wins. She has also finished on the podium in 21 relays, including 5 victories. She has won the 2018–19 Overall World Cup (first Italian to do so, including men). Wierer defended the overall title in the 2019–20 Season (the first to do since Magdalena Forsberg in 2001/02) and has also won 3 disciplines cup, the 2015–16 Individual World Cup, the 2018–19 Pursuit World Cup and the 2019–20 Mass Start World Cup.

Wierer has won her first Biathlon World Championships medal placing third in the Women’s relay together with Nicole Gontier, Michela Ponza and Karin Oberhofer at the Biathlon World Championships 2013 in Nové Město na Moravě, which was the first ever medal for Italian women at the Biathlon World Championships. At the 2019 Championships in Östersund she won the Gold medal in the 12.5 km Mass Start, also a first for Italian women in Biathlon. She has currently won 10 medals in total, including 3 Golds, 4 Silvers and 3 Bronzes.

Dorothea Wierer Corradini (Italian: [doroˈtɛːa ˈviːrer korraˈdiːni] , German: [doʁoˈteːa ˈviːʁɐ] ; born 3 April 1990) is an Italian biathlete competing in the Biathlon World Cup. Together with Karin Oberhofer, Dominik Windisch and Lukas Hofer she won a bronze medal in the Mixed relay at the 2014 Winter Olympics, in Sochi, Russia. At the 2018 Winter Olympics in Pyeongchang, South Korea she won again the bronze medal in the Mixed relay with Lisa Vittozzi, Lukas Hofer and Dominik Windisch. She is the 2019 mass start world champion, and 2020 individual and pursuit world champion.