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. Tide also runs the buses in northern Rogaland on contract with Kolumbus.

The group has two daughter companies, Tide Buss AS that operates the scheduled busses, and the leisure travel company Tide Reiser AS that also operates express, airport and charter buses and chartered ferries and fast passenger craft.

Formerly, Tide operated the passenger- and car ferry routes previously operated by HSD and Stavangerske, with the daughter company Tide Sjø.

The company was delisted from the Oslo Stock Exchange when it was acquired by Det Stavangerske Dampskibsselskap.