Loustau is a surname. Notable people with the surname include:
César Loustau (1926–2011), Uruguayan architect and historian Félix Loustau (1922–2003), Argentine footballer Juan Carlos Loustau (born 1947), Argentine football referee Ludovic Loustau (born 1973), French rugby union player Maurice Loustau-Lalanne, Seychellois politician Patricio Loustau (born 1975), Argentine football referee
See also Lousteau