Viper, Steel roller coaster at Six Flags Magic Mountain, California, US.

Viper is a steel roller coaster in California and ranks among the major looping structures at the park. The track runs through seven inversions and reaches a top speed of 70 miles per hour (112 kilometers per hour) during the ride.

The installation opened in April 1990 and set records for height and speed among looping coasters at that time. It was built by manufacturer Arrow Dynamics and represented one of the last major projects from that company.

Viper appears in Encino Man (1992), where it is called "Vaper", in True Romance (1993) and in Space Cowboys (2000), where Clint Eastwood's character visits a coaster engineer. It features in the Beverly Hills, 90210 episode "She Came in Through the Bathroom Window" (1993) and the Glee episode "Big Brother" (2012), and is recreated in RollerCoaster Tycoon 2.

The ride begins with a steep climb and then moves through several inversions in quick succession. Riders should be prepared for forceful movements and sudden direction changes throughout the course.

This installation is the last operating roller coaster from Arrow Dynamics featuring seven inversions worldwide. Comparable structures from the same manufacturer were demolished in 2002 and 2010.