Haiku Stairs, Military stairs in Honolulu County, US.

Haiku Stairs is a military stairway on the island of Oʻahu in Honolulu County that climbs almost 4,000 metal steps up the steep slopes of the Koʻolau mountain range. The structure runs through dense greenery and rocky terrain and reaches an elevation of about 850 meters above sea level.

Contractors for the U.S. Navy began the Haʻikū Radio Station in 1942 and commissioned it in 1943, stretching antennae across Haʻikū Valley to reach ships in the Pacific. Wooden stairs were replaced in the mid-1950s by metal steps, counted at 3,922. The station closed in 1958, later hosted an Omega navigation station, and the stairs shut to the public in 1987.

The stairs take their name from Haʻikū Valley, where the Navy built its radio station in 1942; the site is also called the Stairway to Heaven or Haʻikū Ladder. The route appeared on Magnum P.I., and the resulting rise in visitors led the Coast Guard to stop allowing access. Volunteers in the group Friends of Haʻikū Stairs campaigned to keep and reopen the steps.

The stairs are closed to the public and access is treated as criminal trespass, with citations and arrests reported during the 2024 dismantling. Demolition began in April 2024 under a contract awarded to Nakoa Companies, Inc., with sections flown out by helicopter. The Moanalua ridge route to the top is longer and harder, and rescuers have repeatedly been called there.

The singer and comedian Fritz Hasenpusch, known for the Don Tiki show, died of a heart attack during a climb in August 2012. No serious injury or death from an accident on the stairs has ever been recorded. In 2014, six people were arrested and 135 cited for climbing.