Hisar may refer to:
- Hisar Hill, in Serbia
- Hisarya, Bulgaria, also known as Hisar
- Hisar (district), an administrative district in the state of Haryana, India
- Hisar (city), a city and administrative head quarter of Hisar District, Haryana, India
- Hear, Bushehr, a village in Iran
- Hesar, Qazvin, a village in Iran
- Hesar, Mashhad, a village in Iran
- Hesar-e Kordha, a village in Iran
- Hisar Pain, a village in Iran
- Hesar Andaf, a village in Iran
- Hisar-e Sangi, a village in Iran
- Hughes Integrated Surveillance & Reconnaissance, a radar system used on the RQ-4 Global Hawk