José Arturo Castellanos Contreras (23 December 1893 — 18 June 1977) was a Salvadoran army colonel and diplomat who, while working as El Salvador's Consul General for Geneva during World War II, and in conjunction with a Jewish-Romanian businessman named György Mandl, helped save up to 40,000 Central European Jews, most of them from Hungary, from Nazi persecution by providing them with fake Salvadoran citizenship certificates.