Hya

Hya or HYA may refer to:
 * Hya language
 * 3-Hydroxyaspartic acid
 * Barnstable Municipal Airport, in Massachusetts, United States
 * Hungarian Yachting Association
 * Hyampolis, a city in Phocis, Ancient Greece
 * Hydra (constellation)
 * Ia of Cornwall, 5th- or 6th-century Christian martyr