Clydeside Scottish Omnibuses Ltd was a bus operating subsidiary of the Scottish Transport Group formed in June 1985 from Western SMT Company Ltd. The company operated until May 1989, when it was remerged with Western Scottish, the successor company to Western SMT.
From its head office in Paisley, Clydeside Scottish covered an operating area bounded by Largs in the south, the River Clyde to the north and the south side of Glasgow to the east. The company also operated services on the Isle of Bute. It was the largest operator in Inverclyde and Renfrewshire and had depots in Rothesay, Largs, Greenock, Johnstone, Inchinnan, Paisley and Thornliebank in the south of Glasgow. Its fleet numbered 334 buses when formed.
Clydeside Scottish also provided coaches for Scottish Citylink services between Gourock, Glasgow Airport, Glasgow and onward to Edinburgh.
Clydeside Scottish was one of the shortest lived of the "new" Scottish Bus Group subsidiaries, lasting shortly under four years as a stand-alone company. Clydeside was created in preparation for the deregulation of the British bus industry in 1986, and eventual privatisation of the state-owned Scottish Bus Group (SBG). A bright red and yellow livery was introduced for the fleet, and a fleet name displayed in a style different from the corporate SBG look.