Calumma fallax (deceptive chameleon) is a species of chameleon endemic to eastern Madagascar, where its type locality is the Ikongo forest. It was first described by Mocquard in 1900 as Chamaeleon fallax, and it was first described as Calumma fallax in 1986. It is a member of the Chamaeleoninae nominotypical subfamily of chameleons, and is believed to be found over an area of 2,057 km2 (794 sq mi), although the population is unknown.