Leo Picard, also known as Yehudah Leo Picard (born 3 June 1900, died 4 April 1997), was an Israeli geologist and an expert in the field of hydrology.Picard was born in Germany in 1900, and studied at universities in Freiberg and Berlin, in Germany, and in Paris and London, and taught at the University of Florence, Italy. Picard visited Mandate Palestine in 1922 and emigrated there in 1924, where he established the Department of Geology at the Hebrew University of Jerusalem. In 1943, he published his book "Structure and Evolution of Palestine", which become a primary book for the study of geology in Israel.Leo Picard was an expert hydrogeologist and an outstanding general geologist. He wrote about paleontology and stratigraphy, structural geology and tectonics, mineralogy and ore deposits. Well-known is his contribution to the debate on the tectonics of the Dead Sea Rift.