Faletau is a Tongan surname. Notable people with the surname include:
Kuli Faletau (born 1963), Tongan rugby union player Mapa Faletau (born 1967), Tongan noble, diplomat, and civil servant Sione Faletau (born 1988), Tongan rugby union player Taulupe Faletau (born 1990), Tongan-born Welsh rugby union player, son of Kuli