Sven Giegold (born 17 November 1969) is a German politician of the Alliance 90/The Greens who has been serving as the party's deputy chair since 2024, under co-chairs Franziska Brantner and Felix Banaszak.

From 2021 to 2024, Giegold served as State Secretary in the Federal Ministry for Economic Affairs and Climate Action in the coalition government of Chancellor Olaf Scholz.

[5] In 2013, in their capacity as the parliament’s lead negotiators, Giegold and fellow MEP Marianne Thyssen reached an inter-institutional compromise agreement with the member states on the SSM Regulation.

[12] In the negotiations to form a coalition government of the Christian Democratic Union (CDU) and the Green Party under Minister-President of North Rhine-Westphalia Hendrik Wüst following the 2022 state elections, Giegold and Felix Banaszak led their party’s delegation in the working group on finances;[13] their counterparts from the CDU were Lutz Lienenkämper and Günter Krings.

[15] Since 2016, Giegold has been sponsoring a proposal that would redefine how the assembly defines lobbying and set new rules for how MEPs could meet with people trying to influence legislation.