Paul Karl Wilhelm Scheerbart (8 January 1863, Danzig – 15 October 1915, Berlin) was a German author of speculative fiction literature and drawings. He was also published under the pseudonym Kuno Küfer and is best known for the book Glasarchitektur (1914).

Scheerbart was associated with expressionist architecture and one of its leading proponents, Bruno Taut. He composed aphoristic poems about glass for Taut's Glass Pavilion at the Werkbund Exhibition (1914).

Paul Scheerbart began studies of philosophy and history of art in 1885. In 1887 he worked as a poet in Berlin and tried to invent perpetual motion machines. In 1892 he was one of the joint founders of the Verlag deutscher Phantasten (Publishers of German Fantasists).

At this time he was in financial difficulties. After writing in different publications he produced his first novel Die große Revolution (The Great Revolution), which was published by the Insel Verlag. The young Ernst Rowohlt published Scheerbart's bizarre poem collection Katerpoesie and became his friend.

Scheerbart's fantasy essays about glass architecture influenced architects at that time, including the young Bruno Taut. Among his Berlin friends and drinking circle was Erich Mühsam, who dedicated a chapter to Scheerbart in his 'Unpolitical Memories' and Richard Dehmel. Scheerbart was also an important influence on Walter Benjamin who quoted his ideas on glass in his Arcades Project.

Very few of Scheerbart's works have been translated into English. Though the following list also gives English translations of the titles, there is usually no English-language edition of the work available.