Jetline is a roller coaster at Gröna Lund in Stockholm, Sweden. It had gained worldwide recognition for its curved lift hill, an anomaly amongst roller coasters. It opened in April 1988 as a clone of the Knightmare roller coaster at Camelot Theme Park, England. In 1997 it was modified by Maurer Söhne to have a longer and steeper first drop, adding a tunnel at the bottom of the first drop.^[1] Knightmare pulled 5 g while Jetline pulls a more reserved maximum of 4.5 g.

The ride started with a curved lift hill that carries the ride vehicle to a height of 32 metres (105 ft). A right turn leads in to the first drop. The drop leads in to a short tunnel and a turn back towards the station and the rest of the ride. The ride vehicle enters a short brake section which leads into the second drop. The maximum g-force of 4.5 is achieved at the bottom of the second drop. The second part of the ride is composed by banked turns and helices. The last helix leads into a tunnel and the station.^[2] The total duration for the roller coaster is approximately one minute and thirty seconds.^[1]

On 25 June 2023, one person died, and nine were injured in an accident described as a derailment.^[3]

Fourteen people were on the ride during the accident. Three people fell out of the vehicle, where one of the three died, and the other two got seriously injured. Seven other people were sent to hospital, and the remaining evacuated safely.^[4] In the aftermath of the accident, Gröna Lund would close the park for a week for an investigation to take place.^[5]

On 30 June 2023, Gröna Lund said that Jetline would remain closed for the rest of the summer.^[6] The roller coaster will remain closed until the Swedish Accident Investigation Authority has completed its investigation of the accident, which it states will take between ten and twelve months.^[7] On 15 December 2023, Gröna Lund announced that the roller coaster would remain closed throughout all of 2024.^[8]