Haya may refer to:
- Haya (genus), a genus of plants in the family Caryophyllaceae
- Haya (dinosaur), a genus of basal ornithopod dinosaur that lived during the Late Cretaceous from Mongolia
- The Spanish name for beech trees (Fagus), used for the European Beech in Spain and for the Mexican Beech (Fagus mexicana) in Mexico
- An alternative spelling of the shrub Faya (Myrica faya) on the Canary Islands
- A vernacular name for some plants in the family Annonaceae (genera Oxandra and Guatteria), possibly a misapplication of the Spanish name above
- The hay'a tradition in Islamic astronomy
- Alternate name for Hidaj, Iran
Other
- Victor Raúl Haya de la Torre, Peruvian politician
- Princess Haya Bint Al Hussein, wife of Sheikh Mohammed bin Rashid Al Maktoum ruler of Dubai and daughter of King Hussein of Jordan
- Haya people, a people of Tanzania
- Haya language, the language of the Haya people
- "La Haya" is the Spanish name for The Hague, in particular seen in references to Hague Conventions
- Haya, a feminine form of the Hebrew word for Life