[1] Mauclair was a great admirer of Stéphane Mallarmé, to whom he dedicated several works, and of Maurice Maeterlinck.
[1][3] His best-known novel is Le Soleil des morts (1898),[1] a roman à clef containing fictionalized portraits of leading avant-garde writers, artists, and musicians of the 1890s, which has been recognized as an important historical document of the fin de siècle.
[6] Later in life he wrote mainly nonfiction, including travel writing such as Normandy (1939), biographies of writers, artists, and musicians, and art criticism.
In his art criticism, he supported impressionism and symbolism,[1] but disdained Fauvism, writing of the style that "a pot of paint has been flung in the face of the public".
[8] At the end of his life, he collaborated with the Vichy France-regime, and worked for the Grand Magazine illustré de la Race : Revivre.