Keio Line is a collaborative studio album by the French electronic rock guitarist Richard Pinhas and the Japanese noise musician Merzbow.

The album was released in September 2008, on double CD by Cuneiform Records in the US and on triple LP by Dirter Promotions in the UK.

Instead, Akita’s electronics emphasize subtle rumblings, vaguely rhythmic churnings that serve to provide texture and counterpoint to Pinhas’ extended ruminations.

"[11] John Kelma, in All About Jazz, notes the album's "element of interaction ... with Merzbow and Pinhas responding to each other, often with great subtlety, even greater unpredictability and consistently empathic results.

However, Mike Newmark writing for PopMatters was critical of the album's length, and felt that the music's ambient nature made it seem even longer.