| Wailua River | |
| Pushpin Map: | Hawaii |
| Pushpin Map Caption: | Location of mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Hawaii |
| Subdivision Type3: | Region |
| Subdivision Name3: | Kauai |
| Length: | 23.4km (14.5miles) |
| Source1: | North Fork |
| Source1 Location: | Mount Waialeale |
| Source1 Coordinates: | 22.0597°N -159.4925°W |
| Source2: | South Fork |
| Source2 Location: | Hanamaulu |
| Source Confluence Location: | west of Wailua, Kauai County, Hawaii |
| Source Confluence Coordinates: | 22.0417°N -159.3606°W |
| Mouth: | Pacific Ocean |
| Mouth Location: | Wailua, Kauai County, Hawaii |
| Mouth Coordinates: | 22.045°N -159.3364°W |
The Wailuā River is a major river on the island of Kauai in the U.S. state of Hawaii. long, it is one of the largest rivers,[1] as well as Kauai's 5th longest river. It is formed by the confluence of its North and South forks just west of Wailua and enters the Pacific Ocean at . It is the only navigable river[2] (by boats larger than kayaks) in the Hawaiian Islands. It is a center of activity for locals and visitors in the form of boat tours to Fern Grotto, kayaking and water skiing.
The North Fork begins at the Mount Waialeale at coordinates and flows [1] east to its junction with the South Fork. The South Fork forms at the junction of several streams southwest of Hanamaulu and flows east,[1] over Wailua Falls, to its junction with the North Fork.
Other points of interest along the river system include a bird refuge, Kamokila Hawaiian Village, Secret Falls and a pool which formerly included a rope swing.