Unruh (or Unrug) is a surname. Notable people with the surname include:
Antoni Unrug (1860-1939), Polish general
Fritz von Unruh (1885–1970), German dramatist
Hans Victor von Unruh (1806–1886), Prussian politician
Howard Unruh (1921–2009), American spree killer
Jack Unruh (1935–2016), American illustrator
Jesse M. Unruh (1922–1987), American politician
Jessica Unruh, American politician
Józef Unrug (Joseph von Unruh in German; 1884–1973), Polish naval officer
Leslee Unruh, American activist
N. U. Unruh (born 1957), German musician
Otto D. Unruh (1899–1992), American football player and coach
Paul Unruh (born 1928), American basketball player
Paweł Unrug (born 1939), Polish actor and director
Sigismund von Unruh (1676–1732), Polish-Lithuanian Commonwealth noble and court official
William George "Bill" Unruh (born 1945), Canadian physicist
Wiktor Unrug (1886-1973), Polish lieutenant colonel