Mancia is a surname. Notable people with the surname include:
Adrienne Mancia (1927–2022), American film curator Iván Mancía (born 1989), Salvadoran footballer Orietta Mancia (born 1968), Italian runner Saúl Enrique Mancía (born 1983-84), Salvadoran politician Titus Curtilius Mancia, Roman senator