Hasa may refer to:
- Hasa (Korean military), a rank in the Korean military
- Hasa, Al Madinah, Saudi Arabia
- Hearing and Speech Agency of Baltimore
- Hasa of Eshtemoa (3rd–4th century CE), Jewish scholar
- Hasa oasis, a historical region now in Saudi Arabia
- Has-a, a relationship between objects in object-oriented programming
- Hasa, Jordan, a village in Jordan
- Wadi al-Hasa, also called Wadi Hasa, a wadi in Jordan
- Highly accelerated stress audit, a test method to find electronic product defects