Dieter Sieger (born May 3, 1938) is a German architect, shipbuilder, industrial designer, painter and art collector. He is one of Germany's most prominent and distinctive contemporary designers. In the 1980s and 1990s, Sieger made history by making stylistic and cultural orientation in the bathroom a key point of his design. He developed several groundbreaking bathroom concepts and products, most notably the single-lever mixer "Domani" (1985) and the cross-handle tap "Tara" (1992) (both Dornbracht).