Great American Scream Machine, Wooden roller coaster at Six Flags Over Georgia, United States

The Great American Scream Machine is a wooden roller coaster at Six Flags Over Georgia in Austell, Georgia, built by Philadelphia Toboggan Coasters. Its light-coloured timber frame forms a broad triangular silhouette, rising from a low base on the left to a tall curved peak on the right, with the track running along the top edge. The open lattice of beams and diagonal bracing leaves gaps through the structure, and a train of linked cars climbs the upper left slope.

The coaster opened in 1973 as the world's tallest, longest, and fastest wooden roller coaster at that time. Its early records established it as a landmark achievement in roller coaster engineering.

The American Coaster Enthusiasts organization designated this roller coaster as a landmark in 2017 for its historical importance and maintenance standards.

Riders must be at least 1.07 m tall. Each train has six cars with two rows of two seats, and riders are held by headrests, seat belts and one-click lap bars that lock magnetically under the train. Normal operation uses two trains, though one suffices; if the station train has not cleared the platform, the incoming train stops abruptly in the main brakes.

The coaster ran backwards in spring 1993 for its 20th anniversary and again in 2018 for its 45th. Its trains were swapped for the former Georgia Cyclone cars in 2018, bringing six cars of two rows each and magnetic-locked lap bars instead of the older electrically released ones.