The Chikugo River (筑後川, Chikugo-gawa) flows through Kumamoto, Ōita, Fukuoka and Saga prefectures in Japan.

With a total length of 143 kilometres (89 mi), it is the longest river on Kyūshū.

33°09′N 130°21′E / 33.15°N 130.35°E / 33.15; 130.35 The upper reaches of the river are important to forestry, and the middle and lower reaches are important to local agriculture, providing irrigation to some 400 square kilometres (154 sq mi) of rice fields on the Tsukushi Plain.

The river is also important to industry, with twenty electrical power plants located along its banks, as well as the major city of Kurume in Fukuoka Prefecture.

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