The Shakujii River (石神井川, Shakujii-gawa) is a river which flows through the northwest quadrant of central Tokyo, Japan. It is one of the tributaries of the Arakawa River. With a total length of 25.2 kilometres (15.7 mi) and a drainage basin of 61.6 square kilometres (23.8 sq mi), it is categorized as a Class A river by the Japanese government.
The Shakujii River has 66[1] bridges over its upstream portion. There are 62[2] over its middle basin. And there are 66[3] bridges over its downstream portion. This makes for a total of 194 bridges.
The famous wooden plank bridge for which Itabashi-ku is named crossed the Shakujii at Nakajuku [ja]. The bridge has now been replaced by a modern ferroconcrete one called Ita Bridge.