Schjetman Reef is a supposed phantom island in the North Pacific west of Hawaii, reported discovered by the Norwegian captain Ole Andreas Schjetnan in 1868. He reported its coordinates to be . The island was reported to be 1.5 nautical miles (2.8 km) long (north-to-south) and 0.5 nautical miles (0.9 km) wide (east-to-west).
Since Schjetnan's discovery, various expeditions have set out to attempt to find the island. The USS Alert in 1880, the USS Milwaukee in 1923, and the USS Whippoorwill and Tanager in 1924 all searched for the island without finding it. A sighting was reported in 1990, however, by a sailor from Hawaii.