Hemicordulia hilaris is a species of Pacific dragonfly in the family Corduliidae, first described by the Dutch entomologist Maurits Lieftinck in 1975.

[1][2] The species is found across the Pacific Islands including Samoa and New Caledonia,[3][4][5] with its range extending east to the Cook Islands and French Polynesia.

[6][7] Hemicordulia hilaris have brown-green abdomens with a metallic sheen.

It can be differentiated from Hemicordulia fidelis, which has a similar appearance, however bright yellow spots on the lower body segments.

[5] The species tends to prefer living in sunny, shallow swamps with dene reed beds.