Río Huicha is a river on the island of Chiloé in Chile's Los Lagos Region, flowing through the grounds of the Estación Biológica Senda Darwin, a biological research station.

The river is known to overflow its banks during periods of heavy rainfall, events that researchers at the station use to study how forests, soils, and water bodies respond to a changing climate.

The river supports notable wildlife, including the kingfisher (Martín Pescador), which is regularly observed hunting from a bridge that crosses the Río Huicha.

The site serves as both a scientific monitoring point and a window into the biodiversity of southern Chile's temperate ecosystems.