The Twilight Zone Tower of Terror, or simply Tower of Terror, is a series of similar accelerated drop tower dark rides located at Disney's Hollywood Studios, Tokyo DisneySea, Walt Disney Studios Park, and formerly located at Disney California Adventure. The attraction is inspired by Rod Serling's anthology television series, The Twilight Zone, and takes place in the fictional Hollywood Tower Hotel in Hollywood, California. The Tokyo version features an original storyline not related to The Twilight Zone and takes place in the fictional Hotel Hightower. All versions of the attraction place riders in a seemingly ordinary hotel elevator, and present a fictional backstory in which people have mysteriously disappeared from the elevator under the influence of a supernatural element many years previously.

A drop tower or big drop is a type of amusement park ride incorporating a central structure or tower. Drop towers vary in height, passenger capacity, lift type, and brake type. Many are custom-made, although there are some mass-produced designs. The most widely sold drop towers have been manufactured by Intamin and S&S Sansei, however Larson International and Funtime have their own drop tower models available as well. Riders initially experience a sense of weightlessness via free fall, followed by rapid deceleration, after which a magnetic brake system brings the ride to a stop. The entire experience generally lasts less than one minute.