Bus Vannin - styled as bus vannin - is the government-owned and operated bus service on the Isle of Man. The name was adopted in June 2009 to replace Isle of Man Transport. The company was founded on 1 October 1976, as National Transport, which was an amalgamation of two other operating companies.

The first omnibus services on the island were provided by the Manxland Bus Co Limited, in addition to several smaller operators which operated independently. The primary means of longer-distance travel were the Isle of Man Railway to the west, south and north (via the west side of the island) and the Manx Electric Railway on the east coast.

When bus competition became a threat to the Isle of Man Railway, it bought out the bus company and operated it as Isle of Man Road Services in conjunction with the railway. In addition to the island-wide services, Douglas Corporation also operated a fleet of buses around the capital, distinctive by their yellow livery. As the railway company began to falter, it relied more heavily on the bus operation, and when the railway lines closed for the first time in 1965 the bus services were intensified to replace the rail services.

The vehicles of Road Services carried an all-over red livery with two off-white bands, and the Railway Company crest was modified to include a facsimile of a bus instead of a railway locomotive. The buses of Douglas Corporation, which only operated within the borough, carried an all-over yellow livery with two red bands and corporation crest.

Both operators used the bus station on Lord Street in Douglas as their base. Today, this site has been given over to a car park, whilst buses use roadside lay-bys on Lord Street itself. The two companies operated services independently from this site until the operations began to falter in the early 1970s at which time government intervention was required to ensure continued operation.

When the service was bought by the Isle of Man government in 1976 the buses carried National Transport logos and a new livery, predominantly of red with white trim, having previously carried a variation of this colour scheme under the Road Services banner. The publicly-owned service used many second-hand vehicles from the United Kingdom and Ireland, a practice which continued until relatively recently, from a variety of sources including Liverpool Corporation, Preston Borough Transport and Ribble Motor Services. Such vehicle types included Leyland Atlanteans from Merseyside PTE, Portsmouth City Transport, SELNEC and Tyne & Wear PTE, Leyland Olympians from Devon General, Dublin Bus and Stagecoach, and Leyland Lynxes from Halton Transport.

By 1987, when a new management scheme was under way, a revised livery of cream and red was introduced, and Isle of Man Transport adopted as the title, using a similar design motif to all the island's government departments including a triskelion motif. During this period the buses carried a variety of advertisements along their side panels, with several distinctive buses carrying all-over advertising for local businesses including the Gaiety Theatre, Lombard Bank, Curraghs Wildlife Park and the National Coal Board.

A further change of leadership in 1999 saw the introduction of brand-new buses and gradual phasing out of older stock, latterly used only on school services, and the advertising policy changed resulting in no advertisements appearing at all. By 2009 a further change of policy resulted in the reintroduction of advertisements which has proved popular, with local radio stations, estate agents, travel agents and cinemas taking advantage of the new schemes.