The Cumbrian dialect is a local English dialect spoken in Cumbria in northern England, not to be confused with the extinct Celtic language Cumbric that used to be spoken in Cumbria. As in any county, there is a gradual drift in accent towards its neighbours. Barrow-in-Furness (within the historic boundaries of Lancashire) has a similar accent to much of Lancashire whilst the northern parts of Cumbria have a more North-East English sound to them. Whilst clearly being an English accent approximately between Lancashire and Geordie it shares much vocabulary with Scots.

'Cumbrian' here refers both to Cumbria and also to Cumberland, the historic county which, along with Westmorland, has formed the bulk of Cumbria since the enactment of local government re-organisation in 1974. There is a Cumbrian Dictionary of Dialect, Tradition and Folklore, which was written by William Rollinson, but is much harder to find a copy of than the respective dictionaries for Lancashire and Yorkshire.

Despite the modern county being created only in 1974 from the counties of Cumberland, Westmorland and north Lancashire and parts of Yorkshire, Cumbria is an ancient land. Before the arrival of the Romans the area was the home of the Carvetii tribe, which was later assimilated to the larger Brigantes tribe. These people would have spoken Brythonic, which developed into Old Welsh, but around the 5th century AD, when Cumbria was the centre of the kingdom of Rheged, the language spoken in northern England and southern Scotland from Lancashire and Yorkshire to Strathclyde had developed into a dialect of Brythonic known as Cumbric (the scarcity of linguistic evidence, however, means that Cumbric's distinctness from Old Welsh is more deduced than proven). Remnants of Brythonic and Cumbric are most often seen in place names, in elements such as caer 'fort' as in Carlisle, pen 'hill' as in Penrith and craig 'crag, rock' as in High Crag.