Jul Låg (13 November 1915 - 2 February 2000) was a Norwegian scientist and soil researcher.
Låg has examined the supply of plant nutrients in precipitation in Norway.
He hired scientists in the field both at home and abroad, organized annual symposia where he gave several speeches, and he edited the books where the various contributions were published.
An area of research, which he started just before he retired, was the impact of soil and rock properties on human and animal health.
Låg was appointed a Knight of the 1st Class of the Royal Norwegian Order of St. Olav (1984), he was Commander[clarification needed] of the Icelandic Order of the Falcon (1970) and received the Copernicus Medal from the Polish Academy of Sciences (1974).