Brilliant Pool is a hot spring in the Upper Geyser Basin of Yellowstone National Park in the United States.

Prior to an eruption by Daisy or Splendid, the pool is filled.

The size of the fountain can reach as much as 15 feet but usually just breaks the surface of the pool.

In the early 1950s, Brilliant Pool experienced a phase where it was overflowing.

During this time, Daisy was dormant until the pool returned to its normal behavior.