Siaosi (George) Manumataongo ʻAlaivahamamaʻo ʻAhoʻeitu Konstantin Tukuʻaho is the crown prince of Tonga. Tupoutoʻa ʻUlukalala became heir apparent to the throne in March 2012 upon the accession of his father, Tupou VI, as King of Tonga.

An heir apparent or simply heir is a person who is first in an order of succession and cannot be displaced from inheriting by the birth of another person. A person who is first in the current order of succession but could be displaced by the birth of a more eligible heir is known as heir presumptive.