Hildegard Anna Augusta Elisabeth Freiin Rebay von Ehrenwiesen, known as Baroness Hilla von Rebay or simply Hilla Rebay (31 May 1890 – 27 September 1967), was an abstract artist in the early 20th century and co-founder and first director of the Solomon R. Guggenheim Museum. She was a key figure in advising Solomon R. Guggenheim to collect non-objective art, a collection that would later form the basis of the Solomon R. Guggenheim Museum collection. She was also influential in selecting Frank Lloyd Wright to design the current Guggenheim museum, which is now known as a modernist icon in New York City.