Elmet is an independent Brythonic kingdom covering a region of what later becomes the West Riding of Yorkshire in the Early Middle Ages, between about the 5th century and early 7th century.

Although its precise borders are unclear, it appears to have been bounded by the River Sheaf in the south and the River Wharfe in the east.

It adjoined Deira to the north and Mercia to the south, and its western boundary appears to have been near Craven, which was possibly a minor British kingdom.

As such it was well to the east of other territories of the Britons in Wales and the West Country (i.e.

Cornwall and Dumnonia), and to the south of those in the Hen Ogledd or Old North.

As one of the southeasternmost Brythonic regions for which there is reasonably substantial evidence, it is notable for having survived relatively late in the period of Anglo-Saxon conquest.

Elmet is invaded and conquered by Northumbria in the autumn of 616 or 626.

The kingdom is chiefly attested in topographical and archaeological evidence, references in early Welsh poetry, and historical sources such as the Historia Brittonum and Bede.

The name survives throughout the area in place names such as Barwick-in-Elmet and Sherburn-in-Elmet.

A local parliamentary constituency is also called Elmet and Rothwell.