Motomiya (本宮市, Motomiya-shi) is a city located in north-central Fukushima Prefecture, Japan.

Located in the center of Fukushima Prefecture, Motomiya possesses a wide range of geographic features from the hills in the east, to the plains in the west.

On the former Motomiya Town side, bordered by the Ōu Mountains (including Mount Adatara) in the west, and the Abukuma River in the east, flat plains run north to south extending into the Kōriyama Basin.

Motomiya has a humid continental climate (Köppen Cfa) characterized by mild summers and cold winters with heavy snowfall.

As a starting point for roads to Aizu, Miharu, Sōma, and many other destinations, Motomiya became well known as an inn town.

In addition, with the growth of lesser roads to Aizu, Adachi no Umaya (安達駅), a government-maintained rest stop and messenger station, was established in Motomiya.

Currently, the stone marker indicating the start of the Aizu road is preserved at the Motomiya City Historical Folk Museum.

After the Meiji Restoration, the area was organized as part of Adachi District in the Nakadōri region of Iwaki Province.

During the Showa era, Gunze, a Japanese textiles company, opened a factory and began operations in Motomiya.

During World War II, Allied bombers attacked Motomiya, because the Gunze factories manufactured cloth used to cover the wings of [ Mitsubishi Zero fighters.

After the war, Japan entered a time of rapid economic growth, and industrial parks were zoned and constructed in Motomiya, Arai, Nukazawa, and Shiraiwa districts.

Because of its shape, homes and businesses line the roads giving it an appearance reminiscent of the Showa era.

This district is a farming area following the Abukuma River with large belts of worked arable land.

Motomiya has a mayor-council form of government with a directly elected mayor and a unicameral city legislature of 20 members.

In terms of national politics, the city is part of Fukushima 2nd district of the lower house of the Diet of Japan.