Pitmatic (originally "pitmatical"), also colloquially known as "yakka", is a dialect of English used in the counties of Northumberland and Durham in England. It developed as a separate dialect from other Northumbrian dialects such as Geordie partly due to the specialised terms used by mineworkers in the local coal pits. For example, in Northumberland and Tyne and Wear the word Cuddy is an abbreviation of the name Cuthbert but in Durham Pitmatic cuddy denotes a horse, specifically a pit pony. In Lowland Scots, cuddie usually refers to a donkey or ass but may also denote a short, thick, strong horse.
Traditionally, pitmatic, together with some rural Northumbrian communities including Rothbury, used a guttural R. This is now less frequently heard; since the closure of the area's deep mines, many younger people speak in local ways that do not usually include this characteristic. The guttural r sound can, however, still sometimes be detected, especially amongst elderly populations in more rural areas.
While in theory pitmatic was spoken throughout the Great Northern Coalfield, from Ashington in Northumberland to Fishburn in County Durham, early references apply specifically to its use by miners especially from the Durham district (1873)  and to its use in County Durham (1930).
Although he did not use the term, Alexander J. Ellis's work on the language of miners "between rivers Tyne and Wansbeck" has been studied as an early transcription of Pitmatic, which used informants from Earsdon and Backworth. In the 1950s, the Survey of English Dialects included Earsdon as a site and many of the forms recorded matched the transcriptions in Ellis's early work, although some appeared to have modified under pressure from other forms of English.
Nowadays "pitmatic" is an uncommon term in popular usage. In recent times, all three dialects have converged, acquiring features from more Standard English varieties. English as spoken in County Durham has been described as "half-Geordie, half-Teesside" (see the article about Mackem).
Melvyn Bragg presented a programme on BBC Radio 4 about pitmatic as part of a series on regional dialects. Pitmatic has rarely featured in entertainment. One of the few cases is the second episode of Ken Loach's series Days of Hope, which was filmed around Esh Winning in Durham with mostly local actors, although the lead Paul Copley has a Yorkshire accent.
Other Northern English dialects include