Mecistogaster is a genus of large Neotropical damselflies in the family Coenagrionidae, commonly known as helicopter damsels.

There are eleven species distributed from Mexico to Argentina.

[1] Members of this genus have very long abdomens which they use to deposit their eggs in the water-filled rosettes of bromeliads growing on trees in the forest.

[2] Species include:

This article related to Coenagrionoidea is a stub.