Wolf Leslau (Yiddish: וולף לסלאו; born November 14, 1906 in Krzepice, Vistula Land, Poland; died November 18, 2006 in Fullerton, California) was a scholar of Semitic languages and one of the foremost authorities on Semitic languages of Ethiopia.
Leslau was born in Krzepice, a small town near , Poland. When he was a child his family was very poor, and after contracting tuberculosis he usually had to keep a thermometer with him to monitor his body temperature, although the reasons for this are unknown. He was orphaned by the age of 10, and was raised by his brother, and received a yeshiva education.
To avoid military service in the Polish army, he gave up his Polish citizenship (becoming a stateless person) and emigrated to Vienna, where he would engage in Semitic studies at the University of Vienna until 1931. He then went to the Sorbonne to study under Marcel Cohen. His studies included most of the Semitic languages, including Hebrew, Aramaic, Akkadian, Soqotri and Ethiopic.
Leslau was arrested by the French police and sent to an internment camp in the Pyrenees where he spent the harsh winter of 1939-1940 with his wife and child. He was later moved to Camp des Milles, a concentration camp near Aix-en-Provence. However, with the assistance of an international aid group, he escaped with his family before the Nazis took over the camp in 1942. They escaped to the United States. He later became a naturalized U.S. citizen.