Daisy Geyser, Geyser in Yellowstone National Park, Wyoming, United States.

Daisy Geyser sits in the Upper Geyser Basin as part of the Daisy Group. Its fountain leaves the vent at an angle to the ground and reaches about 75 feet (23 m), playing for 3 to 5 minutes per eruption. The interval between eruptions runs 110 to 240 minutes, and an eruption of nearby Splendid Geyser can temporarily alter that timing.

A surveying group called the Hague Party named this geyser before 1890, during the early exploration of Yellowstone. Its consistent eruptions soon made it one of the park's key subjects for scientific observation.

The name comes from the Hague Party, who had labelled the feature before 1890. Visitors time their stops around the eruption predictions posted by rangers, since the interval shifts whenever Splendid Geyser erupts nearby. Watching the angled fountain is a scheduled stop rather than a chance encounter.

Eruptions typically occur roughly every two to three hours, making it possible to plan your visit accordingly. Park rangers display predicted eruption times at information points to help guests time their observation of the event.

Daisy Geyser's eruption interval was disrupted by the 2002 Denali earthquake in Alaska, thousands of kilometres away. The gap between eruptions dropped sharply right after the quake, then returned to its usual range over a few weeks. Its schedule is also tied to nearby Splendid Geyser: when Splendid is active, the two influence each other's timing.