Maria "Mary" Servaes-Beij, performing under the stage name Zangeres Zonder Naam, was a Dutch levenslied singer. She recorded almost 600 songs over the course of her career.
Servaes-Beij cared about the poor and disadvantaged, and often performed in prisons and hospitals. She was regularly in direct contact with her public, and received many emotional letters. Zangeres Zonder Naam was one of the artists who performed at the Dutch Miami Nightmare concert, organized against Anita Bryant and her anti-gay movement; Zangeres Zonder Naam performed her own song "Luister Anita", in which she compared Bryant with Hitler.