Oslo Plaza (officially Radisson SAS Plaza Hotel) is situated in Oslo city centre. 117 metres high, it is Northern Europe's tallest and Norway's largest hotel, and the tallest building in Norway. Like almost all modern buildings in Oslo, this tower is disliked by certain groups. Some critics have dubbed it 'Hotel Chisel'; however, the building has not become an 'enemy of the people' like the nearby Post Office Tower (Norwegian:Postgirobygget), despite the fact that Oslo Plaza is both taller and wider.

On the thirty-third and thirty-forth floors (the top of the building), there is a swimming pool and a sauna.

The hotel has 37 floors and 673 rooms. There are a total of 1500 beds, 140 business rooms and 20 suites. The tower's foundations are concrete, and it has reflective glass facades. The uppermost floors are tapered with a steep diagonal roof on one side, leading to a sharp ridge. It also has an external glass elevator, which travels up to the bar/restaurant at the top. A lower block, three floors tall, contains the entrance, a lobby, restaurants and conference rooms.

The building was designed by White Arkitekter and completed in 1989. The Hotel officially opened on March 14th, 1990 by King Olav V of Norway. In 1992, a footbridge was built between the hotel and the Oslo Spektrum arena.