Willibald Karl Jentschke (born 6.12.1911) is an Austrian physicist. He was born in Vienna. He graduated from the University of Vienna, where he worked until 1948, and in 1948 — 56 he worked at the University of Illinois.
In 1956-70 and in 1976-80 he was professor at the University of Hamburg (in 1959 —70 director of the DESY laboratory). In 1971-75 he was Director-General of CERN.
His research has concerned high-energy physics and accelerator technology.