Simone Nassar Tebet (Portuguese pronunciation: [siˈmoni naˈsaʁ ˈtɛbetʃi]; born 22 February 1970) is a Brazilian lawyer, professor, and politician who served as Minister of Planning and Budget from 2023 to 2026. A member of the Brazilian Socialist Party (PSB), she previously served as Senator for Mato Grosso do Sul from 2015 to 2023, vice-governor of the same state from 2011 to 2014, and mayor of Três Lagoas from 2005 to 2010, becoming the first woman to hold the latter two posts.

The daughter of Ramez Tebet, a former President of the Federal Senate, she built her career in Mato Grosso do Sul before entering national politics in 2015. In the Senate she led the Brazilian Democratic Movement (MDB) caucus, presided over the Constitution, Justice and Citizenship Commission, and stood for the Senate presidency. Holding socially liberal and pro-market positions, she has been active on gender equality and agribusiness policy.

Tebet was the MDB's candidate in the 2022 presidential election, campaigning on a centrist Third Way platform and finishing third in the first round with 4.16% of the vote. She endorsed Lula ahead of the runoff, which he won narrowly, and joined his cabinet the following year. As minister, she was a leading advocate of fiscal discipline and institutional stability, often acting as a bridge between the government's left-leaning bloc and business sectors. In 2026, Tebet left the MDB for the PSB to run for the Senate in the 2026 São Paulo general election with Lula's support.

Tebet was born in Três Lagoas on 22 February 1970 to governor, senator, and President of the National Congress Ramez Tebet and Fairte Nassar Tebet, a philanthropist, both of Lebanese descent.

Tebet graduated in law from the Federal University of Rio de Janeiro and is a specialist in legal science from the Escola Superior de Magistratura, and has a master‘s degree in state law from the Pontifical Catholic University of São Paulo. She began her career as a professor in 1992, working at Dom Bosco Catholic University, Anhanguera-Uniderp University, and the Federal University of Mato Grosso do Sul.

She was a legal technical consultant for the Legislative Assembly of Mato Grosso do Sul between 1995 and 1997 and legislative technical director between 1997 and 2001.

Simone Tebet started her career in 2002 when she was elected as a state representative in Mato Grosso do Sul with 25,251 votes, becoming the most voted woman that year.

In 2004 Tebet was elected for the first time as the first female mayor of Três Lagoas.