Thornhill (surname)
Thornhill is a surname. Notable people with the surname include:
- Alan Thornhill, British sculptor
- Arthur Thornhill, English politician
- Batt Thornhill, Irish sportsperson
- Charles Thornhill, English cricketer
- Claude Thornhill, American pianist, arranger and bandleader
- Claude E. Thornhill, American college football player and coach
- Dorothy Thornhill, British politician, Mayor of Watford
- Frederick Thornhill, English cricketer
- George Thornhill , English member of parliament
- George Thornhill , English cricketer
- James Thornhill, English painter
- Juan Thornhill, American football player
- Leeroy Thornhill, British electronic music artist
- Leonard W. Thornhill, American World War II Naval officer and pilot
- Lisa Thornhill, American actress
- Matt Thornhill, English footballer
- Michael Thornhill, Australian film producer, screenwriter, and director
- Pauline Thornhill, host and producer of Canadian Broadcasting Corporation's longest running regional television program, Land and Sea
- Roland Thornhill, Canadian politician
- Siri Thornhill, Norwegian soprano
- Thomas Thornhill, British politician
- Tom Thornhill, American lawyer and politician
- William Thornhill, English politician
- William Pole Thornhill, English politician and landowner
;Fictitious
- Roger O. Thornhill, character played by Cary Grant in North by Northwest
- Ernest Thornhill, alias of The Machine in Person of Interest
