Hannō (飯能市 Hannō-shi) is a city located in Saitama Prefecture, Japan. The city was founded on January 1, 1954.
As of April 1, 2011, the city has an estimated population of 82,683 and a population density of 614.29 per km². The total area is 134.60 km².
Hannō is mainly made up of urban and suburban areas, surrounded by mountains and rivers.
On January 1, 2005, the village of Naguri (from Iruma District) was merged into Hannō.
- Hannō Festival, which held on November 3 to 5, since 1970, as known for festival in Saitama Prefecture.
The anime series Encouragement of Climb is set in Hannō.