George Tupou I, King of Tonga (c. 1797 – 18 February 1893), originally known as Tāufaʻāhau I with some extra names: Tupou Maeakafaua Ngininginiofolanga (in modern spelling, originally Tubou Maeakafaua Giniginiofolaga), but took the name Siaosi (in modern spelling, originally Jiaoji, the Tongan version of George, after king George III of England) when baptized in 1831.

His nickname is Lopa-ukamea (or Lopa-ʻaione), “iron cable”.