Dan Hardy Yaalon (Hebrew: ?? ????? ?????; May 11, 1924, Uherské Hradište, Czechoslovakia – January 29, 2014, Mevasseret Zion, Israel) was an Israeli pedologist and soil scientist, who contributed to the fields of arid and Mediterranean pedology and paleopedology, as well as the history, sociology, and philosophy of soil science.
Through a research career spanning over six decades (1950–2014), Yaalon was an active member of the International Union for Quaternary Research (INQUA) and the International Soil Science Society (ISSS; later the International Union of Soil Sciences; IUSS).
He was awarded the Sarton Medal for his contribution to the history of science, and the Dokuchaev Award.