Prado Reservoir is a reservoir in northwestern Riverside County and southwestern San Bernardino County, a couple of miles west of the city of Corona, in the U.S. state of California.

The reservoir has a capacity of 362,000 acre-feet (447,000,000 m3) and is formed by Prado Dam on the Santa Ana River.

The dam is composed of rock-fill and has a height of 106 feet (32 m) above the original streambed.

The dam was built by the United States Army Corps of Engineers and was completed in 1941.

When the water level reaches the top of the buffer pool, whose size changes depending on time of year, water is released at the maximum rate that the downstream channel will safely allow.