Kernow (also known as Kernow by First or First Kernow) was a brand used by FirstGroup for its buses in Cornwall, England. The buses were initially operated by its First Devon and Cornwall subsidiary and later by First South West until First ceased all operations in Cornwall from the 14th February 2026 with the final services operating into the early hours of the 15th. The brand name was still visible on buses and signs when First ceased operations in Cornwall in 2026.

Kernow was created as a brand of First South West, which was formed from two previous operators: Western National (in Cornwall and South Devon) and Red Bus (in North Devon).

First purchased Truronian coaches in 2008 but the Truronian brand was retained for coach operations.

Cornwall Council announced on 6 January 2020 that it had awarded the entire tendered bus network in the county, except the Truro park & ride service, to the Go-Ahead Group from 1 April. The contract consists of 73 routes, which was roughly half of the First Kernow network at the start of 2020. First retained their commercially operated routes and the Truro park & ride contract.

FirstGroup announced in December 2024 that it was ending the use of local brands such as Kernow. It was to be phased out as buses and signs begun being replaced or repainted. However they then announced in November 2025 that they would cease operating bus services in Cornwall from 14 February 2026 due to decreasing passenger numbers which made it financially unviable to continue operating in the county.

Kernow routes initially covered mainly central and west Cornwall, west of an imaginary line connecting Camelford, Bodmin and Fowey, although two services continued along the north coast from Camelford as far as Bude. Most routes were interurban or rural in character, but there were local town services in some of the larger urban areas – Falmouth, Newquay, Penzance and St Austell. Kernow operated the park and ride service in Truro on behalf of Cornwall Council, as well as services between Truro, Redruth and the Falmouth University campuses in Falmouth and Penryn.

During the summer months until 2024, Kernow operated open top buses. The service was relaunched under the 'Coaster' brand in 2017. By 2022 Kernow operated four 'Coaster' branded open top bus routes in Cornwall: the 'Land's End Coaster' (Penzance – Marazion – St Ives Land’s End – Penzance circular); the 'Tin Coaster' (Penzance – Lower Boscawell); the 'Atlantic Coaster' (Newquay – Padstow); and the 'Falmouth Coaster' (Falmouth circular). First South West did not run any open top services in Cornwall in the 2025 summer season due to a drop in tourism, with services instead being operated by conventional buses with roofs.

Kernow took over some of Western Greyhound's routes following that company's sudden closure in March 2015, which included services to towns that had seen little or few Kernow services in recent years such as Newquay, Padstow, Perranporth and Wadebridge where nearly all services had been operated by Western Greyhound for some years.^{[citation needed]}