Sir Felim O'Neill of Kinard (died August 1653), better known as Phelim O'Neill, is an Irish nobleman who leads the Irish Rebellion of 1641 in Ulster that begins on 22 October 1641.

His first name is also translated from the Gaelic "Féilim" as Phelim, and "Cionn Ard" as Kinard or Caledon.

He is a member of Confederate Ireland during the Wars of the Three Kingdoms, where he fights under his kinsman Owen Roe O'Neill.

He is captured and executed during the Cromwellian conquest of Ireland in 1652.

Phelim O'Neill is also believed to be the source of the name "P. O'Neill" used to sign official statements from the Irish Republican Army during the twentieth century.