Rory O'Donnell, 1st Earl of Tyrconnell (Irish: Rudhraighe Ó Domhnaill; 1575 – 18 July [N.S. 28 July] 1608), was an Irish earl and soldier.
A member of the O'Donnell clan of Tyrconnell, he fought alongside his older brother Hugh Roe O'Donnell during the Nine Years' War against the Tudor government. Following Hugh Roe's death, Rory surrendered to royal forces and in September 1603 was created 1st Earl of Tyrconnell. Rory was his brother's tanist but his claim to the chieftainship was disputed by his cousin Niall Garbh O'Donnell.