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 has designed more than 500 houses, and was also a pioneer of bathroom design. Sieger has designed a wide-range of products for building interiors, as well as designing watches and yachts.