Carey or Cary Dillon, 5th Earl of Roscommon, PC (Ire) (1627–1689) was an Irish nobleman and professional soldier of the seventeenth century. He held several court offices under King Charles II and his successor King James II. After the Glorious Revolution he joined the Williamite opposition to James and was in consequence attainted as a traitor by James II's Irish Parliament in 1689. In that year he fought at the Siege of Carrickfergus shortly before his death in November of that year.