Ioana Lorena Diaconescu (born 30 June 1979, in Bucharest) is a former Romanian freestyle swimmer. She represented her native country at the 1996 and 2000 Summer Olympics.
In 2000, at the European LC Championships in Helsinki, Finland, she was on the women's relay team, that won the gold medal in the 4×200 m freestyle.
Diaconescu's daughter, Rebecca Diaconescu, is also an Olympic swimmer who competed at the 2024 Summer Olympics.[1]