Rosemarijn Agnes (Roos) Vermeij (born March 28, 1968, in The Hague) is a Dutch politician. As a member of the Labour Party (Partij van de Arbeid) she was an MP between November 30, 2006, and March 23, 2017. She focused on matters of employment and social security.
She has been an alderwoman of Rotterdam since 18 February 2021, replacing Barbara Kathmann.
Vermeij studied history at Leiden University.