George Johnston Allman (28 September 1824 – 9 May 1904) was an Irish professor, mathematician, classical scholar, and historian of ancient Greek mathematics.

His fame rests mainly upon his authorship of Greek Geometry from Thales to Euclid, first published in Dublin in 1889,[1] and republished several times subsequently.

[2] He held the position of Professor of Mathematics at Queen's University of Ireland for forty years, from 1853 until reaching retirement age in 1893.

Author of the following papers, amongst others: "Method of deriving the Polar Equations of Dynamics & Hydrodynamics from direct physical considerations" – Dublin University Phil Transactions 1848.

"On the Attraction of Ellipsoids, with a new demonstration of Clairaut's Theorem, being an account of the late Prof MacCullagh's lectures", Trans RI Academy 1855.