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. It is situated 1.3 mi (2.1 km) east of Guerneville. The town's name is meant to mean "river nest" in Spanish. 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 unofficial slogans are "Memories That Linger" and "The Moon Is Always Out In Rio Nido".
As of 2010, Rio Nido has about 522 residents.