Wailua River State Park, Hawaiian state park in Kauai County, US.

Wailua River State Park covers the valley of the Wailua River on Kauai's east side, the only navigable river in Hawaii. The park includes the Wailua Complex of Heiaus, a National Historic Landmark with remains of heiau (places of worship), a puʻuhonua (place of refuge), and sites tied to royal births. Only Holoholokū Heiau has been largely restored.

Sacred temples and stone structures in the park served as power centers for Hawaiian chiefs during ancient times. These sites were religious and ceremonial hubs that shaped the region's early history.

Wailua was one of the largest ahupuaʻa on Kauai and the land of the aliʻi, and King Kaumualiʻi's favourite residence is said to have been here. The name Hikinaakalā means "Rising of the Sun". The old trail from Hikinaakalā Heiau to Kaʻawakoʻo on Mount Waiʻaleʻale, long called the King's highway, is still held sacred, and the huakaʻi po, ghost warriors, are said to walk it at night.

The park welcomes visitors daily without entrance fees and offers boat tours and kayak rentals at the marina. Come prepared for humid conditions and wet footing on trails, as the tropical environment stays damp year-round.

The Bellstone on Puʻuki Ridge was struck to announce royal births, a royal procession, or war canoes entering Wailua Bay. Believed destroyed in ancient times, it was photographed in 1988 by Helene Dunbar. It stands near Poliʻahu Heiau, Holoholokū Heiau and the birthing and navel stones.