Jan Marinus Wiersma (born 26 August 1951 in Groningen) is a Dutch politician and from 1994 to 2009 Member of the European Parliament. He is a member of the Labour Party, vice-chair of the Party of European Socialists group, and sits on the European Parliament's Committee on Foreign Affairs.

He was also a member of the Subcommittee on Security and Defence, a substitute for the Committee on Transport and Tourism, a member of the delegation to the EU–Romania Joint Parliamentary Committee, and a member of the delegation to the EU–Moldova Parliamentary Cooperation Committee.

• Higher degree in history (Groningen State University, 1978)
• Researcher on Foreign Affairs and Defence for the parliamentary PvdA group in the Second Chamber (1978–1987)
• International Secretary and second Vice-Chairman of the PvdA (1987–1999)
• Member of the European Parliament (1994–2009)
• Vice-Chairman of the PSE Group (1999–2004)
• Member of the PSE bureau (since 2004)
• Member of the Steering Committee of the European Forum for Democracy and Solidarity

• Official website Wiersma
• European Parliament biography^{[permanent dead link]}
• Declaration^{[permanent dead link]} of financial interests (in Dutch; PDF file)

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