塔帕若斯河（Rio Tapajós）是南美洲巴西的河流，河道全长约1,200英哩，发源自南纬14度25分的巴西高原，最后注入亚马逊河。

塔帕若斯河的最长支流是特利斯皮里斯河。

The Tapajós (Portuguese:Rio Tapajós [ˈʁi.u tɐpɐˈʒɔs]) is a river in Brazil. It runs through the Amazon Rainforest and is a major tributary of the Amazon River. When combined with the Juruena River, the Tapajós is approximately 1,200 mi (1,900 km) long. For most of its length it runs through Pará State, but the upper (southern) part forms the border between Pará and Amazonas State. The source is at the Juruena–Teles Pires river junction. The Tapajós River basin accounts for 6% of the water in the Amazon Basin, making it the fifth largest in the system.