Gaia Trafikk was the largest public transportation provider in Bergen and Os, Norway until it merged with HSD forming Tide.

The route network covered most of Bergen, but the western suburbs were serviced by Hardanger Sunnhordlandske Dampskipsselskap (HSD).

This resulted in a fixed fleet between the yellow buses of Bergen Sporvei and the red buses of Pan Trafikk being operated by the same company, and coordinated, making a more user-friendly bus system.

Gaia Trafikk is merged with HSD forming the company Tide.

Both British Arriva and the Norwegian Nettbuss had announced a wish to buy Gaia, indicating a price around NOK 400 million.