Dutch architect, who was a founder member of the De Stijl group and municipal architect for Rotterdam.
Born in Purmerend, Oud worked for a period in Germany under the town-planning expert Theodor Fischer (1862–1938). In 1917 he joined the painters Theo van Doesburg (1883–1931) and Piet Mondrian in publishing the periodical De Stijl and forming part of the associated group. In architecture, this group promoted a severe cubist style in which ornament was not used. However, after disagreement with Doesburg, Oud left the group in 1921. In 1918 Oud was appointed architect to the City of Rotterdam and between the wars built several housing estates in the De Stijl idiom, which were influential among architects interested in mass-produced low-cost housing. Oud resigned as architect to Rotterdam in 1927 and thereafter his style became lighter and somewhat decorative, his only important building in this style being the Shell building in The Hague (1938–42).