Károly Balzsay (born 23 July 1979) is a Hungarian former professional boxer who competed from 2004 to 2012. He won the WBO super-middleweight title in 2009 by defeating Denis Inkin, making one successful defence before losing to Robert Stieglitz later that year. In 2011, Balzsay defeated Stanyslav Kashtanov to win the vacant WBA (Regular) super-middleweight title, also making one defence the following year.