Incilius aucoinae is a species of toads in the family Bufonidae. It is found in south-western Costa Rica and adjacent western Panama. Before its description in 2004, it was confused with Incilius melanochlorus.

Etymology: The specific name aucoinae honors Lisa Aucoin (1971–2001), an American herpetologist who died in a car accident shortly after returning from a trip to Costa Rica.

Habitat and conservation: It is a very abundant species living in forested habitats, from tree plantations to primary forests. Reproduction takes place in broad, low-gradient streams and rivers during the dry season. There are no important threats to this adaptable species; it also occurs in several protected areas.