The giant spiny skink or Poncelet's helmet skink (Tribolonotus ponceleti) is a species of lizard in the family Scincidae.

The species is endemic to the Solomon Islands.

Jean-Baptiste Poncelet (1884-1958), French missionary and naturalist.

[2] The preferred habitat of T. ponceleti is forest at altitudes of 0–250 m (0–820 ft).

[1] Unlike most skinks, T. ponceleti has the ability to vocalize.