Siobhan Claire Byrne (born August 13, 1984 in Ostfildern, Baden-Württemberg, Germany) is a German-born Irish sabre fencer.
She is a four-time All-American (2005–2008), a three-time Academic All-Big Ten honoree, and a two-time medalist at the Junior World Cup Fencing Series.
She also won a bronze medal for her category at the 2007 Junior European Championships in Conegliano, Italy, and was ranked as the no.
1 Irish fencer.Byrne represented Ireland at the 2008 Summer Olympics where she competed in the women's individual sabre event.
She lost the first preliminary round match to Poland's Irena Wieckowska, with a score of 8–15.Byrne is also a member of the fencing team for the Ohio State Buckeyes (under her coach Vladimir Nazlymov), and a summa cum laude graduate, with a degree in health information management and systems, at the Ohio State University in Columbus, Ohio.