Kasia Gruchalla-Wesierski (born March 31, 1991) is a Canadian rower. Gruchalla-Wesierski's hometown is Calgary, Alberta.
Gruchalla-Wesierski was originally an alpine skier, however a broken leg injury resulted in her switching to rowing. Gruchalla-Wesierski made her national team debut in 2018.
In 2019, Gruchalla-Wesierski was part of the eights boat, finishing in fourth at the World Championships and qualifying Canada the boat for the 2020 Summer Olympics.
In June 2021, Gruchalla-Wesierski was named to Canada's 2020 Olympic team in the women's eights boat. At the Olympics, the boat won the gold medal, Canada's first in the event since 1992.