Westenholz is a surname. Notable people with the surname include:

• Anders Westenholz (1936–2010), Danish psychologist and writer
• Charles Westenholz (1945–2006), British alpine skier
• Elisabeth Westenholz (born 1942), Danish classical pianist and organist
• Joan Goodnick Westenholz (1943–2013), American archaeologist
• Piers Westenholz (born 1943), British alpine skier
• Sophia Maria Westenholz (1759–1838), German classical composer, musician, singer and music educator