Kelvin Scottish Omnibuses Ltd was a bus operating subsidiary of the Scottish Transport Group based in Bishopbriggs, Strathclyde, Scotland. It was formed in March 1985 from parts of Walter Alexander & Sons (Midland) Ltd and Central SMT, initially with six depots and a varied fleet of 381 vehicles.

The company expanded its operations in Glasgow prior to bus deregulation in 1986. New services were introduced in competition with Strathclyde Buses, many using AEC Routemaster double-deckers operated by conductors. Kelvin suffered from vehicle maintenance problems, and on two occasions was forced to hire vehicles from other companies to ensure operation of all its routes. After Kelvin lost money in 1987, the depot at Milngavie was closed and many routes withdrawn.

In July 1989 Kelvin was merged with Central Scottish to form Kelvin Central Buses. This company was sold to its employees on privatisation, before being taken over by Strathclyde Buses. It is now part of First Glasgow.

Operating from its head office in Bishopbriggs and depots in Old Kilpatrick, Milngavie, Kirkintilloch, Kilsyth, Stepps and Cumbernauld, Kelvin Scottish had an operating area bounded by Loch Lomond to the west, Cumbernauld to the east, the Campsie Fells to the north and the River Clyde to the south. Kelvin was the largest operator in Dunbartonshire and north east Glasgow, and was responsible for urban, rural and interurban services. Its operating area had previously been served by W. Alexander & Sons (Midland), Central SMT and Scottish Omnibuses (whose Baillieston depot had closed a few months earlier in 1985, with its vehicles and operations having transferred to Alexander (Midland) at Stepps).

Kelvin was created by the Scottish Bus Group (SBG) as a limited company wholly owned by the group in March 1985 in preparation for bus deregulation the following year, and began operation three months later. It was the largest of the four new companies created by the SBG in 1985, with an initial fleet of 381 vehicles, of which almost 300 were sourced from the former Alexander (Midland) fleet.

In early 1986, maintenance problems saw a number of vehicles banned from use by vehicle examiners from the Ministry of Transport. The company was forced to hire eight vehicles from other companies to keep services running; they remained in the fleet for four weeks while the regular vehicles were repaired. Similar issues resurfaced in February 1987, when twelve vehicles were hired for three weeks.

Deregulation presented both challenges and opportunities for Kelvin Scottish. During the regulated era, bus operators were protected from competition but could not change their routes without the approval of the licensing authority, and rival operators could object to applications. Historically, Glasgow Corporation had sought to prevent Scottish Bus Group services from penetrating into the middle of the city centre, partly to avoid congestion in the busiest streets but also as a means of bolstering their own tramway revenue. When Kelvin Scottish was formed, the former Alexander (Midland) and Scottish Omnibuses routes from north and east of the city terminated at Buchanan bus station on the northern edge of the city centre, whilst the former Central SMT routes from the west used Anderston bus station on the western extremity of the city centre. Passengers wishing to travel further into the city centre had to either walk or change to a Strathclyde Buses service. Deregulation allowed services to be extended further into the city centre, which would make services more convenient for passengers. On the other hand, a significant proportion of Kelvin's route network served the city's suburbs and peripheral estates and had been protected from competition from Strathclyde Buses due to the arbitrary company boundaries which regulation had created. As the city had expanded outward, Glasgow Corporation had not been allowed to extend its own services to serve these new estates as they were deemed to be SBG 'territory'. These busy and profitable urban routes were an important part of Kelvin's business, but with deregulation Strathclyde Buses would be able to extend their existing city services out to serve these areas, which would cause a serious loss of revenue for Kelvin. The inherited route network was therefore extensively reorganised in an effort to retain as many of the suburban passengers as possible whilst gaining new passengers within the city.

Although deregulation itself took place in October 1986, Kelvin received permission to introduce its new routes from 31 August. Many of the routes serving the suburbs and peripheral estates were linked together to create new cross-city routes instead of terminating in the city centre, with some of these being operated by former London Transport AEC Routemasters. The elderly Routemasters were faster than other buses because instead of passengers paying the driver on entry the fares were collected by a conductor whilst on the move, and the much shorter dwell time at bus stops gave Kelvin a competitive advantage over Strathclyde Buses' slower one-person-operated services. Some cross-city routes were operated jointly with Clydeside Scottish, and a number of new services were started on city routes which had not hitherto been served by the Scottish Bus Group. Another competitive tactic was the introduction of minibus services in the north of Glasgow, providing services into city centre at a much higher frequency than would have been viable using full-sized buses. In response Strathclyde Buses extended many of its city services not just into the peripheral parts of the city traditionally served by Kelvin, but also beyond the city boundary and deep into SBG territory, including the towns of Clydebank, Milngavie, Kirkintilloch and Cumbernauld.