Oslo Visitor Centre Accessible from inside the main train station and from Jernbanetorget. Sells transport tickets as well as the useful Oslo Pass, and can help with booking activities. Publishes free guides to the city.

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Den Norske Turistforening Tourist Information Centre DNT provides information, maps and brochures on hiking in Norway and sells memberships that include discounted rates on mountain huts along the main hiking routes. You can also book some specific huts and pick up keys, as well as buy hiking gear.

UNGinfo The exceptionally helpful and savvy Ungdomsinformasjonen (Youth Information Office, also known as USE-IT) is aimed at backpackers under the age of 27. It can help make (free) bookings for inexpensive or private accommodation and answer any questions you have about Oslo.