Overview

Lilian M.C. Marijnissen (born 11 July 1985 in Oss) is a Dutch politician who leads the Socialist Party (SP) in the House of Representatives. She became the SP's political and parliamentary leader on 13 December 2017, succeeding Emile Roemer. Since entering national politics she has been a prominent voice for the party's social-democratic and left-wing priorities.

Early life and education

Marijnissen grew up in Oss in a family active in the Socialist Party; her father, Jan Marijnissen, is a well-known former SP leader, and her mother, Mari-Anne Marijnissen, served as an alderman in Oss. She studied political science, attending both Radboud University Nijmegen and the University of Amsterdam, where she developed academic foundations later applied to her public work.

Local politics and union experience

Marijnissen began her political career at the municipal level. She served as a councillor in Oss from 2003 until 2016. During this period she combined elected office with work for the trade union Abvakabo FNV, gaining experience in labour issues, public services and grassroots organising. This background reinforced her reputation as a politician focused on workers' rights and local public services.

National parliamentarian and party leader

She entered the House of Representatives (Tweede Kamer) on 23 March 2017 and quickly rose to party leadership later that year. As parliamentary leader, Marijnissen coordinates the SP's legislative agenda, represents the party in debates and media, and shapes policy priorities. Under her stewardship the SP has emphasized social welfare, affordable housing, accessible healthcare and protection for workers.

Positions, style and public role

Marijnissen is known for a direct communication style and a focus on social justice. She often frames issues in terms of income inequality, public-sector funding and labour protections. Her approach blends local experience with national policymaking, and she routinely participates in parliamentary committees and public debates on social and economic policy.

Notable facts and distinctions

  • Born into a family with deep ties to the SP, giving her a distinct continuity with the party's recent history.
  • Combined municipal governance, trade-union work and national office — a path that reflects the SP's grassroots orientation.
  • Has held leadership since December 2017 and serves as a regular spokesperson for the party on social and labour issues.

For further information about the party and her predecessors, see the official party pages and biographical sources from the Dutch parliament and media outlets.