The Synod of Whitby was an important alleged synod which led to the unification of the church in England. Summoned by King Oswiu of Northumbria in 663 AD, the synod was held in 664 at Whitby Abbey, which was Saint Hilda's double monastery of Streonshalh , at Whitby.

Among prelates in attendance was Saint Wilfrid (634-710), who was chief spokesman for the southern, Roman, church. It is his biography, written long after the events it purports to describe, that is the only surviving source for the Synod.

The synod of Whitby constituted a milestone in the history of the church in Britain, since delegates from the North and the South came together to debate the future of the church in Northumbria. The actual matters in dispute were fairly minor, the main controversies being over how to calculate the date of Easter, and what style of tonsure clerics should wear. However, whichever side was acknowledged as having authority to rule on these matters would also decide whether the Celtic or the Roman church would have ascendency over the whole North of England. The matter came to a head one spring when the king, who followed the Celtic practice, was feasting at Easter, while the Queen, who followed Roman practice, was still fasting for Lent.

Final judgement went to the Roman Church, whose practices were then adopted by the Northumbrians. Supporters of the Celtic traditions withdrew to Scotland.

The Venerable Bede in his History of the Church, described the proceedings in detail, but he did not write his account until seventy years after the events he describes. The Anglo-Saxon Chronicle, however, makes no mention at all of the synod.

See also

• Celtic Christianity
• Cuthbert of Lindisfarne
• Religion in the United Kingdom