Hermann Ulrich Kantorowicz (November 18, 1877, Posen, German Empire – February 12, 1940, Cambridge) was a German jurist.
He was a professor at Freiburg University (1923-1929), and a Visiting Professor, Columbia University (1927), as well as at Kiel University (1929-1933).
He was dismissed from Kiel on political and antisemitic grounds in 1933, and became lecturer at the 'University in Exile' and at City College, New York, 1933–34.
Then he was lecturer at the London School of Economics, All Souls College Oxford and Cambridge University, 1934–37, and Assistant Director of Research in Law, Cambridge, 1937-1940.