Tide ASA is a public transport company in Vestland, Norway which resulted from the merger of Gaia Trafikk and Hardanger Sunnhordlandske Dampskipsselskap (HSD).

The company provides the public transit network in the city of Bergen, and most of the bus service in the former Hordaland county on contract with Skyss.

Plans for mergers and takeovers in Hordaland's public transport business came forth in September 2005 when Connex Norge reported interest in purchasing Gaia.

On November 8 Gaia and HSD suggested a merger between the two companies instead, but the city cabinet leader of Bergen, Monica Mæland and the mayor of Os opposed the idea.

As majority shareholder in Gaia, the city council in Bergen decided to vote in favour of the HSD-Gaia merger on June 19, 2006.

This motion failed on November 20, 2006[3] A new general meeting was called for Gaia and on July 17, the merger was approved in that company as well.

[4] Initially, the buses in the new company retained their old colors, yellow for Gaia, red and white for HSD, with only the logo being changed.