Sérgio Vieira de Mello (Portuguese pronunciation: [ˈsɛʁʒju viˈejɾɐ dʒi ˈmɛlu]; 15 March 1948 – 19 August 2003) was a Brazilian United Nations diplomat who worked on several UN humanitarian and political programs for over 34 years. The Government of Brazil posthumously awarded the Sergio Vieira de Mello Medal to honor his legacy in promoting sustainable peace, international security and better living conditions for individuals in situations of armed conflict, challenges to which Sérgio Vieira de Mello had dedicated his life and career.