Hayden P. O’Byrne
United States Attorney // Southern District of Florida
Hayden O’Byrne was appointed as the United States Attorney for the Southern District of Florida by Acting United States Attorney General James McHenry III. He was sworn into office on January 28, 2025, by Chief United States District Judge Cecilia M. Altonaga.
“I am both humbled and honored to serve as the United States Attorney for the Southern District of Florida,” said O’Byrne. “I look forward to collaborating with the dedicated team in this office and our law enforcement partners to uphold the rule of law, defend our nation, and safeguard our local communities.”
Prior to his appointment, O’Byrne served as an Assistant United States Attorney in Miami, where he handled a wide array of cases, including transnational human trafficking, narcotics, firearms trafficking, alien smuggling, and white-collar crimes. More recently, his focus shifted to prosecuting complex, victim-centered crimes, particularly those involving gang-related violence and fraud.
Before joining the Department of Justice, O’Byrne worked as an associate attorney at the Miami office of K&L Gates. There, he represented clients in a variety of civil matters, including trademark, fraud, product liability, and employment disputes, as well as multi-district class action litigation.
O’Byrne earned both his law degree and a bachelor’s degree in history and political science from the University of Miami in Coral Gables, Florida.
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