The Cornish dialect (also known as Cornish English, Anglo-Cornish or Cornu-English; Cornish: Sowsnek Kernowek) is a dialect of English spoken in Cornwall by Cornish people. Dialectal English spoken in Cornwall is to some extent influenced by Cornish grammar, and often includes words derived from the Cornish language.

The accent and speech patterns found in Cornwall are broadly referred to as the Cornish dialect or Cornu-English. It is a distinct variety of West Country English that has been heavily influenced by the extinct (but currently reviving) Celtic Cornish language (Kernewek). Within the county, you may hear it referred to locally as "Kernesh." The accent is characterized by its rhoticity (pronouncing the 'r' after vowels) and unique grammatical structures, such as using "us" instead of "we" or specific vocabulary like "dreckly" (meaning "at some point soon," but rarely immediately). There is a notable difference between the East Cornish accent, which is more closely aligned with the general South West English (Devon) sound, and the West Cornish accent, which retains more of the ancient Celtic lilt and vocabulary. In 2026, while the accent is becoming less pronounced among younger generations in urban areas, it remains a proud and significant marker of Cornish cultural identity and heritage in rural and coastal communities.