Westenholz is a surname. Notable people with the surname include:
Anders Westenholz (1936–2010), Danish psychologist and writer Caroline de Westenholz (born 1954), British-Dutch historian Charles von Westenholz (1945–2006), British alpine skier Elisabeth Westenholz (born 1942), Danish classical pianist and organist Jane von Westenholz (born 1953), British courtier Joan Goodnick Westenholz (1943–2013), American archaeologist Piers von Westenholz (born 1943), British alpine skier Sophia Maria Westenholz (1759–1838), German classical composer, musician, singer and music educator