Thomas George Bonney FRS (27 July 1833 – 10 December 1923) was an English geologist, president of the Geological Society of London.

[3] Thomas was educated at Uppingham School and St John's College, Cambridge, where he graduated as 12th wrangler in 1856, and was ordained in the following year.

[2] From 1856 to 1861 he was mathematical master at Westminster School, and he pursued geology only as a recreational activity, mainly in Alpine regions.

His attention was specially directed to the study of the igneous and metamorphic rocks in Alpine regions and in various parts of England (e.g.: the Lizard in Cornwall, at Salcombe and in the Charnwood Forest), Wales and the Scottish Highlands.

His purely scientific works are: In addition to many papers published in the Quarterly Journal of the Geological Society and Geological Magazine, he wrote several popular works on Alpine Regions, on English and Welsh scenery, as well as on theological subjects.