Sérgio Vieira de Mello (Portuguese pronunciation: , 15 March 1948 – 19 August 2003) was a Brazilian United Nations diplomat who worked for the UN for more than 34 years, earning respect and praise around the world for his efforts in the humanitarian and political programs of the UN.
Sérgio Vieira de Mello (15. marts 1948 – 19. august 2003) var en brasiliansk FN-diplomat, som i over 34 år arbejdede for de Forenede Nationer og opnåede respekt og ros over hele verden for sit arbejde i FN's nogle gange ubestemmelige humanitære programmer.