John Wesley Judd CB FRS FGS (18 February 1840 – 3 March 1916) was a British geologist.

From 1867 - 1870, Judd worked for the Geological Survey of England and Wales, mapping Rutland, before joining the Education Department, under Matthew Arnold, as an Inspector of Schools in 1871.

[2] In his spare time, Judd continued his geological studies in Scotland, and later in the volcanic districts of Italy.

He was elected a Fellow of the Royal Society in 1877, having been nominated by Charles Darwin, George Julius Poulett Scrope, Nevil Maskelyne and Edward Hull, among others.

[5] He retired from Imperial College in 1905. Notable pupils of his include Edgeworth David, William Fraser Hume and Frederick Chapman.