Maria (Mary) Servaes-Beij (Dutch pronunciation: [maˈri sɛrˈvaːs bɛi̯]; Leiden, 5 August 1919 – Horn, Netherlands, 23 October 1998) was a Dutch levenslied singer. She performed under the stage name Zangeres Zonder Naam (English: Singer without a name). She recorded almost 600 songs over the course of her career.^[1][2]

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.^[1] The Zangeres Zonder Naam was one of the artists who performed at the Dutch Miami Nightmare concert (Amsterdam, 8 October 1977). This evening was directed against Anita Bryant and her anti-gay movement, and the Zangeres Zonder Naam performed her own song Luister Anita ("Anita, listen to me"), in which she compared Bryant with Hitler.^[1]