Rio Nido, California (From Spanish: Río Nido, meaning Nest River) is a small, unincorporated resort community on the Russian River, in Sonoma County, California, United States.

One account has it that the name was originally the more grammatically correct "El Rio Del Nido", "referring to the nest of an eagle once seen in a tree on the banks of this stream".

Rio Nido's Post Office is a small unit on the side of its fire station.

The San Francisco Chronicle once reported the extended appearance in Rio Nido by singer-actress Betty Hutton.

Rio Nido is about 5 miles (8 km) north of the famed Bohemian Grove.

Loudspeakers were set up around the square and on the beach, playing music from KSRO in Santa Rosa.

On summer evenings Dick Crest (1930-2010), a teacher and band director at the College of San Mateo, led a small orchestra in free concerts in the town square and at dances.

The National Weather Service reports that Rio Nido, as well as surrounding communities in the Russian River valley, has warm, dry summers with chilly night and morning fog, and cool, wet winters.

Of Rio Nido's population, 84.9% is White, 0.8% Black or African American, 1.5% Native American or Alaskan Native, 1.3% Asian, 0.8% Pacific Islander; 6.5% are of two or more races, and 10.9% are of Hispanic or Latino origin (of any race).