Unibuss, formerly known as AS Sporveisbussene and Nexus Trafikk, is a Norwegian bus company based in Oslo, Norway.

It is a subsidiary of the municipal public transport group Sporveien, and was created in 2003 to allow the company to compete for the public service obligation (PSO) contracts through which Oslo was to operate its bus system.

With 1860 employees, the company had an operating income in that year of NOK 1684 million.

The transfer of routes to Unibuss has been criticized among other things because the employees in Nexus Trafikk have worse pension conditions than in Sporveisbussene.

[3] This was an inevitable move, as all bus transport in Oslo and Akershus is tendered and Unibuss had to adhere to the same tariffs as its competitors in order to be competitive.