Maria Osmarina Marina da Silva Vaz de Lima (born Maria Osmarina da Silva; 8 February 1958), known as Marina Silva, is a Brazilian politician and environmentalist, currently serving as Minister of the Environment and Climate Change, a position she previously held from 2003 to 2008. She is the founder and former spokeswoman of the Sustainability Network (REDE). A former senator for the state of Acre between 1995 and 2011, she has been a federal deputy for the state of São Paulo since 2023. She ran unsuccessfully for president in 2010, 2014 and 2018.

Silva was a member of the PT until 2009, and served as a senator before becoming Minister of the Environment in 2003. She ran for president in the 2010 Brazilian elections as the candidate for the Green Party, coming in 3rd with 19% of the first-round vote. In April 2014, Eduardo Campos announced his candidacy for the fall 2014 presidential election, naming Marina Silva as his vice presidential candidate. After Campos's death in a plane crash on August, she was selected to run as the Socialist Party's candidate for the presidency, winning 21% of the vote and coming in 3rd. She again ran for president in the 2018 election, this time as the nominee for the Sustainability Network, finishing in 8th place with 1% of the vote.

Silva has won a number of awards from US and international organizations in recognition of her environmental activism. In 2010, she, along with Cécile Duflot, Monica Frassoni, Elizabeth May and Renate Künast, were named by Foreign Policy magazine to its list of top global thinkers for taking Green mainstream. She was one of eight people chosen to carry the Olympic flag for the opening ceremonies of the 2012 London Summer Olympics.

Marina Silva was born Maria Osmarina da Silva in the small village of Breu Velho, 70 km outside Rio Branco, Acre. Silva is a descendant of Portuguese and black African ancestors in both her maternal and paternal lines. She was one of eleven children in a community of rubber tappers on the Bagaço rubber tree plantation (Portuguese Seringal Bagaço), in the western state of Acre. Growing up, she survived five bouts of malaria in addition to cases of hepatitis and metal poisoning.

At age 16, young Marina moved to the state capital, Rio Branco, to study and receive treatment for hepatitis. She was taken in by nuns in a convent and received a Catholic education. There, she became the first person in her family to learn to read and write. After leaving the convent, she went to work as a housemaid in exchange for lodging. She completed her undergraduate degree in history from the Federal University of Acre at 26 and became increasingly politically active. In 1984 Silva helped create Acre's first workers' union.

She led demonstrations called empates with Chico Mendes to warn against deforestation and the outplacement of forest communities from their traditional locations.

She helped Chico Mendes to lead the trade union movement, being elected as councillor of Rio Branco in 1988 for her first mandate in a public office.

In 1994, Silva was the first rubber tapper ever elected to the Federal Senate. As a native Amazonian and a senator, she built support for environmental protection of the reserves as well as for social justice and sustainable development in the Amazon region.