Katarzyna "Kasia" Wasick (born Wilk; 22 March 1992) is a Polish competitive swimmer who specializes in sprint freestyle.

Wasick represented Poland at the 2008, 2012, 2016, 2020, 2024 Summer Olympic Games in Beijing, London, Rio de Janeiro, Tokyo and Paris as well as other international meets.

[4] After graduating from high school, Wasick trained in Poland with her brother Robert Wilk at the AZS AWF Katowice swim club before the 2012 Olympics in London.

[6][7] She finished the year earning a bronze medal in 50m freestyle at the 2021 World Short Course Swimming Championships in Abu Dhabi, United Arab Emirates in December.

[8] Wasick competed for the Cali Condors in the inaugural season of International Swimming League and reached the finals at Mandalay Bay in Las Vegas.