Hasnain is a given name. Notable people with the name include:
- Constance J. Chang-Hasnain, American electrical engineer, and John R. Whinnery Chair Professor at University of California, Berkeley
- Maisam Hasnain (born 1977), former Pakistani cricketer
- Seyed E. Hasnain (born 1954), Distinguished Professor of Biological Sciences at the Indian Institute of Technology, Delhi, India
- Syed Ata Hasnain, Indian Army General officer
- Syed Mahdi Hasnain, General in the Indian Army
- Hasnain Gulamabbas Dewji, Member of Parliament in the National Assembly of Tanzania
- Hasnain Kazim, German journalist
- Hasnain Khan (born 1996), Pakistani cricketer
- Golam Hasnayen (1929–2021), Bangladeshi lawyer and activist