The Giant Dipper, also known as the Mission Beach Roller Coaster, and historically by other names, is a historical wooden roller coaster located in Belmont Park, a small amusement park in the Mission Beach area of San Diego, California.

The coaster occupies an irregular area about 100 by 500 feet (30 m × 152 m) in size, and is accessed via a terminal structure on its west side.

[5] The coaster was built in 1925 as part of a major real estate development led by John D. and Adolph Spreckels to attract visitors and residents to the Mission Beach area.

[5] Threatened with demolition by the city in 1978, local citizens banded together to rescue it and a few surviving attractions of the defunct park.

The radio station arranged a second marathon in 1998, which was eventually won by contestants who split a check for $50,000 in cash prizes after riding the coaster for 70 days.