Mariska Majoor (Hilversum, 2 November 1968[1][2]) is a Dutch writer, publicist, speaker, entrepreneur, and former sex worker.[2][3] She founded the Prostitution Information Center (1994) and the labour union PROUD (2015) in Amsterdam to support (novice) sex workers and inform passers-by/tourists and the general public, answer questions and dispel misconceptions about everything involving sex work. Majoor gives lectures and presentations on sex work, and has written several books including Als sex werken wordt (1999; English When Sex Becomes Work, 2016),[2] United Under a Red Umbrella: Sex Work Around the World (2018), and Amsterdam Red Light District: The future of our past (2023). In 2017, Mariska Majoor was knighted by the Mayor of Amsterdam in recognition of her contribution to sex workers' rights in the Netherlands.[4]