Birgit Skarstein (born 10 February 1989) is a Norwegian competitive adaptive rower and para cross-country skier.
In rowing at the 2016 Summer Paralympics, she finished fourth in the single sculls event. In cross-country skiing at the 2014 Winter Paralympics, Skarstein competed in the 1 km sprint classic, 5 km free, and 15 km free events. In cross-country skiing at the 2018 Winter Paralympics, she competed in the 1.5 km sprint classic, 7.5 km classic, and 15 km free events.
Skarstein won a gold medal in PR1W1x at the 2017 World Rowing Championships in Sarasota, ahead of Moran Samuel.
In 2019 she qualified to represent Norway at the 2020 Summer Paralympics held in Tokyo, Japan after winning the gold medal in the PR1 Women's single sculls event at the 2019 World Rowing Championships.