Trioceros chapini, also known commonly as Chapin's chameleon, the gray chameleon, and the grey chameleon, is a species of lizard in the family Chamaeleonidae. The species is native to Central Africa.
The specific name, chapini, is in honor of American ornithologist James Paul Chapin.
T. chapini is found in the Democratic Republic of the Congo and Gabon.
The preferred natural habitat of T. chapini is forest.
The mode of reproduction of T. chapini is unknown.