Orsolya "Orsi" Ferenczy (born 25 June 1984) is a Hungarian former swimmer, who specialized in butterfly events.

[2] Ferenczy made her own swimming history, as a 16-year-old teen newcomer, at the 2000 European Junior Swimming Championships in Dunkerque, France, where she earned a bronze medal in the 50 m butterfly with a time of 28.07, finishing behind Israel's Vered Borochovski and Netherlands' Hinkelien Schreuder by more than half a second (0.50).

Swimming in heat four, she faded down the stretch from second at the final turn to share a third seed with Belgium's Fabienne Dufour in a matching time of 1:01.15.

[5][6] Ferenczy also teamed up with Ágnes Kovács, Gyöngyver Lakos, and Annamária Kiss in the 4×100 m medley relay.

Swimming the butterfly leg in heat one, Ferenczy posted a split of 1:00.61, but the Hungarians raced to the fifth spot and thirteenth overall in a final time of 4:11.11.