Saga Prefecture (佐賀県, Saga-ken^?) is a prefecture in the northwest part of the island of Kyushu, Japan. It touches both the Sea of Japan and the Ariake Sea. The western part of the prefecture is a region famous for producing ceramics and porcelain, particularly the towns of Karatsu, Imari, and Arita. The capital is the city of Saga.

In ancient times, the area composed by Nagasaki Prefecture and Saga Prefecture was called Hizen Province. The current name dates from the Meiji Restoration. Rice farming culture has prospered here since ancient times, and vestiges can be seen at the ruins of Nabatake in Karatsu and the Yoshinogari site in Yoshinogari.

From the Kamakura period to the Muromachi period, it is thought that over 100 feudal clans existed. Also exerting great influence during this time was a samurai clan operating along the Genkai Sea called the Matsuratō. Upon entering the Sengoku period, the Ryūzōji clan expanded their control to include all of Hizen and Chikugo Provinces, and part of Higo and Chikuzen Provinces. After the death of daimyō Takanobu Ryūzōji, Naoshige Nabeshima took control of the political situation, and by 1607 all of the Ryūzōji clan's domain was under the control of the Nabeshima clan.

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