Crystal Geyser is a cold water, carbon dioxide driven geyser located on the east bank of the Green River approximately 9 miles (14 km) downstream from Green River, Utah, United States.

The first written record of Crystal Geyser comes from the July 13, 1869 entry for the Powell Geographic Expedition of 1869 as reported in Powell's book, The Exploration of the Colorado River and Its Canyons: An hour later we run a long rapid and stop at its foot to examine some interesting rocks, deposited by mineral springs that at one time must have existed here, but which are no longer flowing.

The ground water near the geyser has significant quantities of dissolved carbon dioxide, along with substantial underground gas accumulations in the surrounding area.

The source of the groundwater is the nearby Green River, which flows along the Little Grand Wash Fault and dissolves the calcium carbonate from the underlying Middle Jurassic strata, particularly the Summerville Formation.

In the preface to an eruption, water surfaces, fills the pond around the geyser, and begins to bubble.

The current form of the geyser was created by an exploration well drilled in 1935 in attempt to locate oil.