Dora Maria de Louw, also known by her full married name Dora Maria Zweers-de Louw, was a Dutch singer and singing teacher with a soprano range. She was born in Delft on 4 July 1876, the daughter of court photographer Henri de Louw and Doris Kirchner, whose mother was the photographer Emma Kirchner.
De Louw studied at the Royal Conservatory in The Hague with Arnold Spoel. In 1897, on the advice of her fiancé, she entered the Amsterdam Conservatory, where Cornélie van Zanten taught her. After graduating, she continued her vocal studies with Aaltje Noordewier-Reddingius.
She married the composer Bernard Zweers in 1899. Around 1900 she sang with the Concertgebouw Sextet and also appeared in Concertgebouw subscription concerts conducted by Willem Mengelberg, Cornelis Dopper and Johan Schoonderbeek. Between 1904 and 1929, she performed fifteen times in the Concertgebouw's Main Hall. In 1920, she sang two versions of her husband's Gitnajali with Jan van Gilse and the Utrecht Symphony Orchestra at Tivoli in Utrecht.
Her repertoire combined standard works with contemporary music by composers including Claude Debussy and Hugo Wolf, and she also performed songs in the Dutch language. She maintained a large circle of pupils and declined teaching posts at the conservatories in The Hague and Amsterdam, though she taught for a time at the Amsterdam Music Lyceum. She continued to give singing lessons until her death; her students included Lya Ziverts, Nora Heintz and Corry Bijster. The composer Rosy Wertheim studied singing with her.
Bernard Zweers wrote several songs for her. Jetty van Lennep dedicated Nu kwam de winter and De ziel spreekt to De Louw, while Henriëtte van den Brandeler dedicated her Drie liederen of 1910 to her.
De Louw died in Bennebroek on 16 August 1959, aged 83. She was cremated in Velsen.
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