The Battle of Stamford Bridge took place at the village of Stamford Bridge, East Riding of Yorkshire, in England on 25 September 1066, between an English army under King Harold Godwinson and an invading Norwegian force led by King Harald Hardrada and the English king's brother Tostig Godwinson. After a bloody battle, both Hardrada and Tostig along with most of the Norwegians were killed. Although Harold Godwinson repelled the Norwegian invaders, his army was defeated by the Normans at Hastings less than three weeks later. The battle has traditionally been presented as symbolising the end of the Viking Age, although major Scandinavian campaigns in Britain and Ireland occurred in the following decades, such as those of King Sweyn Estrithson of Denmark in 1069–1070 and King Magnus Barefoot of Norway in 1098 and 1102–1103.

The death of King Edward the Confessor of England in January 1066 had triggered a succession struggle in which a variety of contenders from across north-western Europe fought for the English throne. These claimants included the King of Norway, Harald Hardrada. According to the Anglo-Saxon Chronicle Manuscript D (p. 197), the Norwegians assembled a fleet of 300 ships to invade England. The authors, however, did not seem to differentiate between warships and supply ships. In King Harald's Saga, Snorri Sturluson states, "... it is said that King Harald had over two hundred ships, apart from supply ships and smaller craft." Combined with reinforcements picked up in Orkney, the Norwegian army most likely numbered between 7,000 and 9,000 men. Arriving off the English coast in September Hardrada was joined by further forces recruited in Flanders and Scotland by Tostig Godwinson. Tostig was at odds with his elder brother Harold (who had been elected king by the Witan on the death of Edward). Having been ousted from his position as Earl of Northumbria and exiled in 1065, Tostig had mounted a series of abortive attacks on England in the spring of 1066.

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