The Kashii Line (香椎線, Kashii-sen) is a railway line in Japan operated by Kyushu Railway Company (JR Kyushu).

[1] The Hakata Bay Railway Co. opened the Saitozaki - Sue section in 1904, extending it to the Otani coal mine (1 km beyond Umi) the following year.

Sakado station - The 14 km Katsuta line was opened by the Chikuzen Sangu Railway Co. from Yusu (on the Sasaguri Line) - Chikuzenkatsuta in 1918–19.

The connection to Sakado opened in 1942, and the line was nationalised in 1944.

Freight service ceased in 1981, and the line closed in 1985.