George Tupou V (Tongan: Siaosi Tupou, full name: Siaosi Tāufaʻāhau Manumataongo Tukuʻaho Tupou) was the King of Tonga from the death of his father Tāufaʻāhau Tupou IV in 2006 until his own death six years later.
Tupou V was born on 4 May 1948. He was the eldest son of King Tāufaʻāhau Tupou IV (1918–2006) and Queen Halaevalu Mataʻaho ʻAhomeʻe (born 1926). Tupou V was appointed Crown Prince on 4 May 1966. In that role, he was better known by one of his traditional chiefly titles, 'Tupoutoʻa.
During his reign, George Tupou V oversaw reforms within the Tongan honours system which both expanded the number of Orders in the Kingdom and created rules to make the award of these Orders more egalitarian.
George Tupou V died from leukemia at 15:15 HKT on 18 March 2012 at Queen Mary Hospital in Pok Fu Lam, Hong Kong.