The Northumbrian burr is the distinctive uvular pronunciation of R in the traditional dialects of Northumberland, Tyneside ('Geordie'), and northern County Durham, now remaining only among speakers of rural Northumberland, excluding Tyne and Wear. It is one of the few rhotic dialects left in England.

According to Påhlsson (1972), the Burr is typically pronounced as a voiced uvular fricative, often with accompanying lip-rounding ([ʁ(ʷ)]). Approximant [ʁ̞], voiceless fricative [χ], tapped [ɢ̆] and trilled [ʀ] uvular pronunciations occur occasionally. The data for Northumberland and northern Durham in the Survey of English Dialects (gathered in the 1950s) suggest that in addition to full pronunciation in syllable onset, uvular /r/ in these dialects was usually maintained in syllable coda position, typically as the uvularization of the preceding vowel.

The Northumbrian Burr has affected the pronunciation of adjacent vowels, particularly those that precede it, which were subject to 'Burr Modification':

In addition, Harold Orton reported that the Burr caused retraction of following alveolar consonants to post-alveolar or retroflex position.

Since uvular R is not typical of other English dialects, it may be assumed that this pronunciation is an innovation in the northeast of England. When it occurred and whether the development is connected with the spread of guttural R throughout much of Western Europe are both unknown.

Heslop (1892) refers to the suggestion by James Murray that the Burr originated in the speech of Harry Hotspur, which Shakespeare describes as peculiar in some way:

Stuck upon him as the sun
In the grey vault of heaven: and by his light,
Did all the chivalry of England move
To do brave acts; he was indeed the glass
Wherein the noble youth did dress themselves,
He had no legs, that practis’d not his gait:
And speaking thick, which nature made his blemish,
Became the accents of the valiant;
For those that could speak low, and tardily,
Would turn their own affection to abuse,
To seem like him: so that, in speech, and gait,
In diet, in affections of delight,
In military rules, humours of blood,
He was the mark and glass, copy and book,
That fashioned others.

However, Shakespeare's text does not indicate what was distinctive about Hotspur's speech so that may not be connected with the Northumbrian Burr.