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Offa (d. July 26, 796) was a King of Mercia (757 - 796). Prior to the rise of Wessex in the 9th century, he was arguably the most powerful and successful of the Anglo-Saxon kings. He effectively ruled the whole of England south of the River Humber during the latter part of his reign.

Following the murder of his cousin, King Æthelbald in 757, Offa defeated and exiled Beornrad, Æthelbald's successor, thus seizing the throne of Mercia. For much of his reign, he endeavored to assert his authority over the Kingdom of Kent. By 764, it was under his influence, for it was then that he installed two client kings there, Heaberht and Egbert. By 772, however, Offa was attempting to rule Kent directly. This provoked a rebellion under Egbert, and a battle was fought at Otford in 776. The outcome was not recorded, but since Offa does not seem to have exercised any authority over Kent during the years that immediately followed the followed the battle, we may consider it likely that it was a Mercian defeat. Offa reestablished his authority over Kent with a subsequent and successful invasion around the year 785, however, and ruled it directly for the remainder of his life.

Elsewhere in England, Offa won an important victory over the West Saxon king Cynewulf at the Battle of Bensington (in Oxfordshire) in 779. In 786, after the murder of Cynewulf, Offa intervened to place Beorhtric on the West Saxon throne. It appears that Offa thereafter exercised authority over Wessex through Beorhtric.

In 794, Offa had the East Anglian king Ethelbert beheaded. The circumstances of this are unclear, but afterward Offa ruled East Anglia.

He introduced silver coinage in England, producing the first English silver pennies, as well as a copy of the gold dinar of the Abbasid caliph Al-Mansur dated 157AH, which differs from the original by adding the inscription OFFA REX. Since this coin contains the Arabic profession of faith in Allah, it has been cited by some as proof that Offa had converted to Islam. However, it is infinitely more likely that the coin was produced in order to trade with Islamic Spain, and the king, his engravers, and officials, simply copied the Arabic coin without any comprehension of what the inscriptions said (particularly considering that "OFFA REX" is upside down in relation to the Arabic script, and the word "year" is misspelled in Arabic).

Although Offa had initially used the title "rex Merciorium" (king of the Mercians), his titles became more grandiose as his reign progressed. In 774, he is first recorded as using the title "rex Anglorum": king of the English. He was thus the first king to use that title, a sweeping statement of his power.

Offa is perhaps best known for Offa's Dyke, a great earthen wall between England and Wales. However, although this landmark is named after him, it is not known with certainty to what extent he was responsible for its construction. Some attribute the building of all or parts of the dyke to earlier periods.

Offa came into conflict with Jaenbert, the Archbishop of Canterbury, and in 786 he tried to reduce the power of Canterbury through the establishment of the rival archdiocese of Lichfield, with the approval of Pope Adrian I.

In his authoritative history, Anglo-Saxon England, Sir Frank M. Stenton argued that Offa was perhaps the greatest king of the Anglo-Saxon kingdoms, the proof of his ability obscured by the lack of a historian to describe his achievements. "No other Anglo-Saxon king ever regarded the world at large with so secular a mind or so acute a political sense," wrote Stenton.

During the last decade of his reign, Offa exerted himself to ensure that his son Ecgfrith would succeed him. In 787, he had Ecgfrith crowned as co-ruler by the Archbishop of Lichfield, Hygeberht. After Offa's death in July 796, however, Ecgfrith survived for only five months, dying under unclear circumstances. Offa's reign marked the apogee of Mercian power: only a quarter of a century after his death (825), the role of leading English power passed to Wessex.