HDRO

AcronymDefinition
HDROHerr Der Ringe Online (German: Lord of the Rings Online)
HDROHuman Development Report Office (UN)
HDROHigh Desert River Outfitters (rafting; Oregon)
HDROHigher Degree Research Office (Macquarie University; North Ryde, New South Wales, Australia)
HDROHumanitarian Disaster Relief Operations
HDROHook Data Readout