Kukui Heiau, Archaeological temple site in Wailua, Kauai County, United States.

Kukui Heiau is an ancient Hawaiian temple site covering about 1.1 acres on Kauai, featuring preserved stone walls and overlooking Wailua Bay. The remaining structures show how the temple was originally built and used for religious purposes.

The site was built centuries ago as a sacred place for Hawaiian worship and remained important to the community through many generations. In 1987 it gained formal recognition on the National Register of Historic Places.

The name Kukui Heiau is also recorded as ʻAʻa Kukui, and the site is a heiau, a Hawaiian temple, on state land. The 1.1-acre grounds were landscaped, yet the facing walls remain, and from them visitors look out over Wailua Bay.

The site sits on state land near Wailua Bay and is now landscaped, so the facing walls can be viewed from the maintained ground around them. Stay on the paths and off the stone walls, which are the surviving structure of the temple. The 1.1-acre parcel is small, so a visit takes little time.

The heiau sits on state land that was donated by neighbouring condominium developers, which is how the 1.1-acre site survived amid resort construction. The property was listed on the National Register of Historic Places in 1987. Its other name, ʻAʻa Kukui, is one detail visitors rarely notice on site signage.