John Young (c.1742 – 17 December 1835) was a British subject who became an important military advisor to Kamehameha I during the formation of the Kingdom of Hawaii. He was left behind by Simon Metcalfe, captain of the American ship Eleanora, and along with a Welshman Isaac Davis became a friend and advisor to Kamehameha. He brought knowledge of the western world, including naval and land battle strategies, to Kamehameha, and became a strong voice on affairs of state for the Hawaiian Kingdom. He played a big role during Hawaii's first contacts with the European powers. He spent the rest of his life in Hawaiʻi. Between 1802–1812, John Young ruled as Royal Governor of Hawaii Island while King Kamehameha was away on other islands. He organized the construction of the fort at Honolulu Harbor. The Hawaiians gave him the name ʻOlohana based on Young's typical command "All hands (on deck)".