Luiz Alberto Figueiredo Machado (born 17 July 1955) is a diplomat who is currently serving as the Brazilian Ambassador for Climate Change since February 2023.

First assigned to New York in 1986 until 1989, he continued his professional career at Brazil's diplomatic missions in Santiago, Chile, serving until 1992.

He has also held diplomatic positions in Washington, D.C. from 1996 to 1999, Ottawa from 1999 to 2002 and Paris, as representative to the United Nations Educational, Scientific and Cultural Organization (UNESCO), from 2003 to 2005.

[4] He served as Director-General in the Ministry's Department of Environment and Special Affairs, and previously headed its Environmental Policy and Sustainable Development Divisions, as well as its Division on Sea, Antarctic and Outer Space Affairs.

He came Under-Secretary for Environment, Energy, Science and Technology in Brazil's Foreign Ministry since 2011.