Carey Dillon, 5th Earl of Roscommon

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.

In his younger days, he was a friend of Samuel Pepys, who in his Diary followed with interest Dillon's abortive courtship of their mutual friend, the noted beauty Frances Butler. The couple did not marry; Carey later married Katherine Werden.