Maria Lúcia Ribeiro' "Lu" Alckmin (born 28 December 1951) is a Brazilian professor who has served as second lady of Brazil since 2023 as the wife of Geraldo Alckmin, the 41st vice president of Brazil.

Alckmin has also served as second lady of São Paulo, first lady of São Paulo, and President of the São Paulo Social Fund. She is the second person to serve as First Lady of São Paulo on two non-consecutive occasions, after Leonor Barros.

Born in São Paulo, São Paulo, Alckmin has distinguished herself for her political leadership. She has been known as a champion of her husband's political causes.

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