Kitsuki (杵築市, Kitsuki-shi) is a city located in Ōita Prefecture, Japan.

After the Meiji restoration, the town of Kitsuki within Hayami District, Ōita was established on May 1, 1889 with the creation of the modern municipalities system.

On April 1, 1955 Kitsuki merged with the villages of Yasaka, Kita-Kitsuki and, Nakarie and was raised to city status.

On October 1, 2005 Kitsuki merged with the town of Yamaka from Hayami District and the village of Ota from Nishikunisaki District, Ōita Kitsuki has a mayor-council form of government with a directly elected mayor and a unicameral city council of 18 members.

In terms of national politics, the city is part of the Ōita 3rd district of the lower house of the Diet of Japan.