Franz Josef Weissmann (September 15, 1911 – July 18, 2005) was a Brazilian sculptor born in Austria, emigrating to Brazil while he was eleven years old.

In Rio de Janeiro, between 1939 and 1941, he attended architecture, painting, drawing and sculpture classes at the National School of Fine Arts.

Starting from 1950 onwards, he gradually developed a constructivist style, favoring geometric shapes, cutting and folding sheets of iron, steel wires and aluminum.

In the 1960s, Weissmann exhibits the series of sculptures Amassados (Dented), which he created in Europe with hammered zinc and aluminum sheets, aligning himself briefly to informalism.

In 1970 he won the award for best sculptor by the Brazilian Association of Art Critics and participated in the International Outdoor Sculpture Biennial, in Antwerp, Belgium, and at the Venice Biennale.