Katarzyna Kłys ("née" Piłocik, 23 April 1986 in Bielsko-Biała, Poland) is a Polish judoka. She represented Poland in the 70 kg event of the 2008 Summer Olympics and lost in the quarter-finals to Ronda Rousey. Four years later, she lost her first round match to Chen Fei in the 70 kg event of the 2012 Summer Olympics. Kłys is a two-time silver medalist in her weight class at the European championships (2007 and 2012). She won another silver medal in the team event of the 2010 European Judo Championships.