Lilian Marie Corneel Marijnissen (born 11 July 1985) is a Dutch politician who served as Leader of the Socialist Party and as its parliamentary leader in the House of Representatives from December 2017 to December 2023.

[1] On December 9, 2023, she announced that she would step down as member of the House of Representatives as well as leader of the Socialist Party in the House of Representatives.

Lilian Marijnissen previously served as a member of the municipal council of Oss from 2003 to 2016 like her mother before her.

From 2018 to 2021, Marijnissen was in a relationship with Dutch television presenter and sports reporter Bart Nolles.

[4][5][6] She later entered a relationship with Joeri Jansen, and their daughter was born in September 2024.