The Twilight Zone Tower of Terror, more commonly known as Tower of Terror, is a simulated freefall thrill ride at Disney-MGM Studios in Lake Buena Vista, Florida and at Disney's California Adventure in Anaheim, California. It is based upon the television show The Twilight Zone. The Disney-MGM ride opened in 1994 and the California Adventure version in 2004.

As part of the Happiest Homecoming on Earth celebration, another Tower of Terror attraction will open at Tokyo Disneysea in Japan (2005), and later at Walt Disney Studios in France (2008). The Tokyo Disneysea Tower of Terror is not authorized by The Twilight Zone, and has a completely different storyline.

The ride is themed to resemble the fictional Hollywood Tower Hotel. The storyline of the ride is that in 1939, the hotel was struck by lightning, transporting an elevator car full of passengers to the Twilight Zone. The exterior of the ride resembles an old hotel with a blackened scorch mark across the front of the facade. At 199 feet, it is the highest attraction at the Walt Disney World Resort and also at the Disneyland Resort.

Guests entering the ride are ushered into the library, where they view a short clip of Rod Serling describing the events at the hotel. From there, guests pass through the hotel's basement "boiler room" and into a large elevator equipped with rows of seats.

In the Florida version of the ride, the elevator rises for a few seconds before coming to a stop. The doors open to reveal a corridor populated by the ghostly occupants from 1939, who then disappear. The corridor fades to a starlit night sky, and a window cracks. The elevator doors close and the car begins to rise again. At the top, the doors again open and the car mysteriously moves forward out of the shaft, through a surreal collection of objects and sights in the style of the television show's opening sequence.

The car stops in complete darkness, and after a pause, shutters open to reveal a view of the park from a height of 13 stories. In the years since the attraction's initial opening, a randomized pattern of "false starts" has been added where the car drops a short distance before shuddering briefly upwards again. After anywhere between one and five tension-building stutters, the car plummets the full distance to the basement.

The ride employs specialized ride technology developed specifically for Disney, particularly the ability to move the elevator cab forward. Although the ride is designed to feel like a freefall, the elevator is actually accelerated downward faster than the pull of gravity for extra thrills.

In an effort to be true to the spirit of the Twilight Zone, Disney Imagineers reportedly watched every episode of the original television show at least twice.