Onderdonk
Onderdonk is a surname. Notable people with the surname include:
- Andrew Onderdonk, construction contractor
- Benjamin T. Onderdonk, bishop of the Episcopal Diocese of New York
- Henry Onderdonk, second Episcopal bishop of Pennsylvania
- Julian Onderdonk, American Impressionist painter
- Robert Jenkins Onderdonk, American painter and art teacher
- William H. Onderdonk, American lawyer