Sacred Falls State Park, State park in Hauʻula, United States

Sacred Falls State Park is a state park near Hauʻula featuring a trail that descends through Kaluanui gulch toward a waterfall. The canyon walls rise sharply on either side, creating a dramatic natural setting shaped by water and erosion.

The state bought the land for $3.5 million in 1976 to create a mountain-oriented park, and it opened in 1980. The trail to the falls was deliberately lengthened from one to two miles to attract only serious hikers. Visits rose from about 7,000 in the first fiscal year to 70,000 in 1991/92. On Mother's Day 1999, eight people were killed and dozens injured by rockfall from a canyon wall above the pool, and the park closed.

The valley's Hawaiian name Kaliuwaʻa means "prepared canoe," taken from two canoe-shaped hollows in the cliff that tradition says were pressed there by the pig demigod Kamapuaʻa. In the story, Kamapuaʻa leaned against the wall, let his grandmother Kamaunuaniho and his people climb on his back, and stretched his body to lift them to the tablelands above, escaping the chief ʻOlopana. Visitors once laid leaves and placed stones on them on entering the valley to show respect to the demigod.

The park entrance sits on Kamehameha Highway south of Hauʻula, but the gate has been shut since the Mother's Day 1999 rockfall. Fines are levied on those caught inside, and in 2015 the park administration placed a QR code at the entrance linking to a video on the rockfall hazards; it had been viewed 18,700 times by May 2020. Trespassers are mostly men in their twenties and thirties.

The cliff walls contain two canoe-shaped depressions that locals attribute to Kamapuaa according to tradition. These unusual formations are now visible only from a distance and remain a mysterious feature of the landscape.