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Haus Wittgenstein, also known as the Stonborough House and the Wittgenstein House) is a house in the modernist style designed and built on the Kundmanngasse, Vienna, by the Austrian architect Paul Engelmann and the Austrian philosopher Ludwig Wittgenstein.

In November 1925, Wittgenstein's sister Margaret Stonborough-Wittgenstein commissioned Engelmann to design and build a large townhouse. Margaret also invited her brother to help with the design in part to distract him from an incident that had happened while he had been a primary school teacher: he had hit a boy for getting an answer wrong and the boy had collapsed. The architect was Paul Engelmann, someone Wittgenstein had come to know during the war when they'd been in the trenches together. Engelmann designed a spare modernist house after the style of Adolf Loos: three rectangular blocks. Wittgenstein showed a great interest in the project and in Engelmann's plans and poured himself into the project for over two years. He focused on the windows, doors, door knobs, and radiators, demanding that every detail be exactly as he specified, to the point where, as Waugh writes, everyone involved in the project was exhausted. One of the architects, Jacques Groag, wrote in a letter: "I come home very depressed with a headache after a day of the worst quarrels, disputes, vexations, and this happens often. Mostly between me and Wittgenstein." When the house was nearly finished he had a ceiling raised 30mm so the room had the exact proportions he wanted.

Waugh writes that Margaret eventually refused to pay for the changes Wittgenstein kept demanding, so he bought himself a lottery ticket in the hope of paying for things that way. It took him a year to design the door handles, and another to design the radiators. Each window was covered by a metal screen that weighed 150 kg, moved by a pulley Wittgenstein designed. Bernhard Leitner, author of The Architecture of Ludwig Wittgenstein, said of it that there is barely anything comparable in the history of interior design: "It is as ingenious as it is expensive. A metal curtain that could be lowered into the floor."