Ninja is an Arrow Dynamics steel suspended roller coaster located at Six Flags Magic Mountain in Valencia, California.

It is the fastest roller coaster of its kind in the world, joint with Vortex at Canada's Wonderland, both with top speeds of 55 mph (89 km/h).

The coaster is located in the Samurai Summit area of Six Flags Magic Mountain in Valencia, California.

The other three suspended coasters in North America (Vortex at Canada's Wonderland, Iron Dragon at Cedar Point and The Bat at Kings Island) are all east of the Mississippi.

Ninja received a fresh coat of paint for the 2007 season; the ride was repainted with bright red track and white supports.