Sir Archibald Geikie corresponded with a number of people both socially and professionally. This sub-series includes the following correspondents:

American geologist, Grove Karl Gilbert (1843-1918), worked for around 30 years for the United States Geological Survey. During that time he was in contact with Sir Archibald Geikie on a number of professional matters.

Robert Alfred Cloyne Godwin-Austin (1808-1884) wrote to Geikie concerning the business of the Geological Survey as well as on geological research. George Gordon of Birnie (1801-1893) was a geologist from Morayshire and corresponded with Geikie about the geology of that area as well as on other professional matters. Following George Gordon's death, Geikie also corresponded with his son, RB Gordon concerning a Royal Society grant which had been made to the deceased.

John George Goodchild (1844-1906) worked with the English Geological Survey and corresponded with Geikie about the geology of the Eden Valley, Cumbria, in particular. Maria Matilda Ogilvie Gordon (1864-1939), a Scottish geologist who spent most of her career in Europe, wrote to Geike primarily concerning her own work and research there.

French geologists, P Glangeaud and J Gosselet both wrote to Geikie on a variety of professional matters, including information on specific areas of England.