Iwona Nina Matkowska-Sadowska ( ; born 28 May 1982 in Żary) is a Polish freestyle wrestler. She competed in the freestyle 48 kg event at the 2012 Summer Olympics; after beating Patricia Bermúdez in the qualifications and Davaasükhiin Otgontsetseg in the 1/8 finals, she was defeated by Mariya Stadnik in the quarterfinals and eliminated by Clarissa Chun in the repechage round. In June 2015, she competed in the inaugural European Games, for Poland in wrestling, more specifically, Women's Freestyle in the 48 kilogram range. She earned a bronze medal.