Octave Maus (12 June 1856 – 26 November 1919) was a Belgian art critic, writer, lawyer and cousin of the painters Anna and Eugène Boch.
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Maus worked with fellow writer/lawyer Edmond Picard, and they together with Victor Arnould and Eugène Robert founded the weekly L'Art moderne in 1881.
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In 1884 Maus was elected the secretary of the recently formed Les XX, and his responsibilities included the organization of the annual exhibitions.
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