The title Tui Manuʻa is considered one of the oldest chiefly title of the Samoa Islands. It was the title of the ruler or paramount chief of the Manu'a Islands Group in present day American Samoa.
The Tui Manu'a is one of the oldest Samoan titles in Samoa. Traditional oral literature of Samoa and Manu'a talks of a widespread Polynesian network or confederacy (or "empire") that was prehistorically ruled by the successive Tui Manu'a dynasties. Manuan genealogies and religious oral literature also suggest that the Tui Manu'a had long been one of the most prestigious and powerful paramounts Samoa. Legends suggest that the Tui Manu'a kings governed a confederacy of far-flung islands which included Fiji, Tonga as well as smaller western Pacific chiefdoms and Polynesian outliers such as Uvea, Futuna, Tokelau, and Tuvalu. Commerce and exchange routes between the western Polynesian societies is well documented and it is speculated that the Tui Manu'a dynasty grew through its success in obtaining control over the oceanic trade of currency goods such as finely woven ceremonial mats, whale ivory "tabua", obsidian and basalt tools, chiefly red feathers, and seashells reserved for royalty (such as polished nautilus and the egg cowry).
The Tui Manu'a lineage of paramounts is unlike the standardised genealogies of the Tu'i Tonga line. There are various Tui Manu'a descent lines, many of which bear little resemblance to each other. It is common belief, however, as part of Samoan myths and legends, that the first Tui Manu'a was a direct descendant of the Samoan supreme god, Tagaloa. In Samoan lore, the islands of Manu'a (Ofu, Olosega, and Ta'u) are always the first lands to be created or drawn from the sea; consequently the Tui Manu'a is the first human ruler mentioned. This "senior" ranking of the Tui Manu'a title continues to be esteemed and acknowledged by Samoans despite the fact that the title itself is no longer occupied.