Maria Luiza Viotti (born on (1954-03-27)March 27, 1954 in Belo Horizonte, Brazil) is the Chef de Cabinet to UN Secretary General António Guterres.
Viotti was the Ambassador of Brazil to Germany from 2013 until 2016, Permanent Representative of Brazil to the United Nations from 2007 until 2013, and President of the United Nations Security Council for the month of February 2011.
She is married to Eduardo Baumgratz Viotti and has a son.