Cáhuil (Mapudungun: Place of seagulls, pronounced [ˈkawil] ⓘ) is a Chilean village located 15 kilometres (9.3 mi) south of Pichilemu, at the mouth of the seasonal Nilahue Estuary, in the O'Higgins Region.

Its economy is based on the production of sea salt, oysters, and mussels.

As of 1978, more than 60% of the population of Cáhuil lives on the proceeds of salt production, unrelated to industrial enterprises.

Along the route are two rural establishments, "Oro Blanco" and "El Bronce".

At least 46 bird species are found in the Cáhuil zone, many of them in danger of extinction.