Paul Engelmann was a Viennese architect who is now best known for his friendship with the philosopher Ludwig Wittgenstein between 1916 and 1928, and for being Wittgenstein's partner in the design and building of the Stonborough House in Vienna.

Engelmann was born at Olmutz in 1891, and studied with the modernist architect Adolf Loos in Vienna. He was supposedly Loos's favorite pupil. He was private secretary to Karl Kraus. He lived mainly in Vienna and Olomouc before he emigrated to Palestine in 1934 and settled in Tel Aviv, where he died in 1965.