The Walt Disney World Monorail System is a monorail serving Walt Disney World in Bay Lake, Florida, near Orlando. Operated by Disney Transport as part of the resort's public transportation system, it runs 12 Mark VI monorail trains across three lines of service.

First introduced in 1971, the system was Disney's second, following the Disneyland Monorail in California. It initially featured Mark IV trains running two services around the Magic Kingdom area: Resort and Express. In 1982, the system expanded to three services with an extension to Epcot, and by 1989, the fleet was upgraded to Mark VI trains.

As of 2016, the Walt Disney World Monorail was the third busiest monorail system globally, carrying over 150,000 passengers daily. It is surpassed by the Chongqing Rail Transit monorail system in China, where Line 2 and Line 3 combined accommodate more than 900,000 daily passengers, and the Tokyo Monorail line in Japan, which serves over 300,000 daily riders.

The Walt Disney World Monorail spans 14.7 miles (23.7 km), with around 50 million Disney guests traveling on the monorail each year. The system opened with the rest of the Walt Disney World Resort on October 1, 1971. It initially featured four stations: the Transportation and Ticket Center, Disney's Polynesian Resort, the Magic Kingdom and Disney's Contemporary Resort. The Epcot line and station were added during that park's construction, opening on October 1, 1982. The most recent addition was the Grand Floridian station, which was opened in 1988 along with the resort hotel. Since then, no further additions have been made, and no expansions are planned due to prohibitive construction costs, though a legal easement for monorail construction through Disney's Saratoga Springs Resort & Spa dating back to 1970 still exists.

There are two distinct routes on the monorail system, with three different services:

A spur track at Magic Kingdom station connects the Express and Resort lines to the maintenance shop. Another spur connects the Epcot and Express lines and is located northeast of the Transportation and Ticket Center.

The monorail beams, which are made of concrete with a special polystyrene core to lighten their weight, came by train from the state of Washington.

The trains in use since 1989 are Mark VI trains, built by Bombardier Transportation. Each train is 203 ft 6 in (62.03 m) long (consisting of six cars) and can carry 360 passengers. The trains are driven by eight 113 hp (84 kW) motors which are powered by a 600-volt electrical system running through a busbar mounted on each side of the concrete beam. Each train also has seven inverters on board that convert the 600 V DC to 230 V AC for use by the air conditioners and air compressor, and additionally has a battery-backed 37 V DC low-voltage supply that provides power for the train's electronics. The trains are also equipped with a towing knuckle at each end to allow it to be pushed or pulled by a special diesel-powered tractor if need be.