A High King of Ireland (Irish: Ard-Rí na hÉireann) is a historical or legendary figure who claimed lordship over the whole of Ireland. Medieval and early modern Irish literature portrays an almost unbroken sequence of High Kings, ruling from Tara over a hierarchy of lesser kings, stretching back thousands of years. Modern historians believe this scheme is artificial, constructed in the 8th century from the various genealogical traditions of politically powerful groups, and intended to justify the current status of those groups by projecting it back into the remote past.

The concept of national kingship is first articulated in the 7th century, but only became a political reality in the Viking Age, and even then not a consistent one. Until quite recently the development of the pre-Norman kingship of Ireland has been expressed in simplistic terms, with both unionist and nationalist historians —for their own respective purposes— happy to portray pre-Norman Ireland as an immutable hierarchy of kings. In Unionist historiography the picture painted has been one of tribal chaos (with Norman invasion supposedly "creating order"), while that of Nationalist historiography has been a Utopian harmony (supposedly destroyed by the invaders).

Modern-day historians reject both of these portrayals as simplistic, presenting a history of Irish kingship that is more complex and parallels the development of national kingship elsewhere in Europe. Early Irish kingship was sacral in character. In the early narrative literature a king is a king because he marries the sovereignty goddess, is free from blemish, enforces symbolic buada (prerogatives) and avoids symbolic geasa (taboos).

According to the seventh and eighth century law tracts, a hierarchy of kingship and clientship progressed from the rí (king of a single petty kingdom) through the ruiri (a rí who was overking of several petty kingdoms) to a rí ruirech (a rí who was a provincial overking).

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