Hannō (飯能市, Hannō-shi) is a city located in Saitama Prefecture, Japan.

Saitama Prefecture Tokyo Metropolis Hannō has a Humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall.

Hannō annexed the neighboring villages of Seimei, Minami-Koma, Kaji and Moto-Kaji on April 1, 1943.

Hannō has a mayor-council form of government with a directly elected mayor and a unicameral city council of 19 members.

In terms of national politics, the city is part of Saitama 9th district of the lower house of the Diet of Japan.