Calumma fallax, the deceptive chameleon or short-nosed deceptive chameleon is a species of chameleon endemic to eastern Madagascar, where its type locality is the Ikongo forest. It was first described by François Mocquard in 1900 as Chamaeleon fallax, and it was first recognized 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.

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