Sir Guenter Heinz Treitel QC FBA (26 October 1928 – 14 June 2019) was a German-born English academic and Vinerian Professor of English Law. Treitel was born in Berlin into a Jewish family, the son of a prominent lawyer, Theodor Treitel, and his wife, Hannah Lilly Levy. In March 1939, he came to England on the Kindertransport together with his older brother, Kurt Max Treitel, and sister Celia. Treitel was once described by Lord Steyn as "one of the most distinguished academic writers on the law of contract in the English speaking world", and has often been described as the leading authority on English contract law. He is the author of Treitel on the Law of Contract, a seminal work on English contract law.