Ilona Novák (16 May 1925 – 14 March 2019) was a Hungarian swimmer and Olympic champion. She competed at the 1948 Olympic Games in London, where she finished 4th in 100 m backstroke and 5th in 4 × 100 m freestyle relay. At the 1952 Olympic Games in Helsinki she received a gold medal in 4 × 100 m freestyle relay as captain of the Hungarian team.
She was inducted into the International Swimming Hall of Fame in Fort Lauderdale, Florida in 1973, together with her sister, Éva Novák.