Orthetrum pruinosum,[2] the crimson-tailed marsh hawk,[3][4][5] is a species of dragonfly in the family Libellulidae.

It is a widespread species occurring from west India to Japan and south to Java and the Sunda Islands.

[4][5][6] A molecular phylogenetics study of Orthetrum dragonflies revealed that Orthetrum pruinosum is a cryptic species.

Young males have red abdomen as in Orthetrum chrysis.

It breeds in ponds, lakes and sluggish streams.