卡普阿斯河（Sungai Kapuas）是印尼西加里曼丹省的河流，河道全长约1,143公里，除了是该国最长的河流、婆罗洲西部的主要河流外，它还是全球最长的岛上河流。

卡普阿斯河整条河道差不多都能让船只航行，因此是西加里曼丹省的重要运输路线，用作运送木材。

The Kapuas River (or Kapueas River) is a river in the Indonesian part of Borneo island, at the geographic center of Maritime Southeast Asia. At 1,143 kilometers (710 mi) in length, it is the longest river of Indonesia and one of the world's longest island rivers. It originates in the Müller mountain range at the center of the island and flows west into the South China Sea creating an extended marshy delta. The delta is located west-southwest of Pontianak, the capital of West Kalimantan province. This Kapuas River should be distinguished from another Kapuas River, which starts on the other side of the same mountain range in central Borneo, but flows to the south, merging with the Barito River and discharging into the Java Sea.