大野城市是位于福冈县福冈市东南方的一个城市，是福冈都市圈的住宅城市之一。

663年白江口之战日本战败之后，由于担心唐朝与新罗联军会趁势进攻日本，天智天皇于665年下令在现大野城市辖区内的大野山创建大野城，以作为防御九州的政治中心大宰府的据点，因此「大野」变成为此地的地名，直到改制为市之前，此地都称为大野。但在1972年改制为市的时候，福井县已有同样名称的大野市，因此改以「大野城市」作为市名。

Ōnojō(大野城市,Ōnojō-shi) is an area located in Fukuoka Prefecture, Japan. Its name is made up of the kanji for 'big', 'field', and 'castle'. It is mostly a southern suburb of the city of Fukuoka, and has a border to the northwest with the Hakata-ku area of the city. It also shares borders with Dazaifu and Kasuga, Umi, Chikushino, Nakagawa and Shime. The border with Umi is marked by the summit of Otoganayama at 268 metres above sea level, a wide expanse of deciduous and bamboo forest, uninhabited except by the occasional snake. The Mikasa river flows through Ōnojō on its way to Hakata bay, with some of its tributaries such as Cow neck river originating in the mountains in the south. Ducks, turtles, koi, egrets, herons and Japanese wagtails can be seen in or around the river, depending on the season.