BizkaiBus is the name for suburban bus and coach services serving the province of Biscay, Spain.

BizkaiBus is the result of the combination of several companies that offered bus travel services in the province of Biscay, TCSA, CAV, PESA, Encartaciones, Euskotren, Adnor and Autobuses de Lujua.

The service is funded by the authority of Biscay or Diputacion Foral and operates as many as 100 bus lines.

Various bus companies have steadily joined the Bizkaibus consortium over the years.

In 2006 the line between Bilbao and Castro Urdiales was excluded from Bizkaibus, as the line was solely funded by the Biscay local authority and the town of Castro Urdiales lies in the province of Cantabria.