Placido Bayou is a gated residential community, bordering its namesake waterway on the shores of northeastern St. Petersburg, nestled between Shore Acres and Snell Isle.

The name Placido Bayou is taken from the Italian word meaning tranquil. It is one of the few gated, deed-restricted communities in St. Petersburg city limits, and is cherished for its privacy and sense of security.

Placido Bayou is known as a peaceful habitat for wildlife and wild birds of all kinds.