Paul Engelmann (14 June 1891 – 5 February 1965) 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. His Letters from Ludwig Wittgenstein With a Memoir was translated by L. Furtmüller and published in 1967 by Basil Blackwell.