Reginald Koettlitz was born on 23 December 1860 in Ostend.^{[citation needed]} His father was a Lutheran minister, and his mother was English. He was educated at Dover College and later Guy's Hospital in London, where he received training as a physician. He practiced medicine near Dover.^[1]

In 1894, Koettlitz joined the Jackson–Harmsworth expedition to Franz Josef Land in the Arctic, as physician and geologist. On returning to Dover, brought back a polar bear, which is still in the Dover Museum.^{[citation needed]} Koettlitz Island (Ketlitsa Ostrova) – a low-lying island in the British Channel in the Franz Josef Land archipelago – is named after him.^{[citation needed]}

In 1900 he travelled to Somaliland and Abyssinia with Herbert Weld Blundell. He also journeyed to the Amazon.^[1]

In 1901, Koettlitz volunteered for Robert Falcon Scott's Discovery Expedition to Antarctica, as physician and botanist.^[1] Many of his samples are held in the archives of the Natural History Museum, London. His assistant on this trip was E.A. Wilson, later surgeon on Scott's ill-fated Terra Nova Expedition. On a trip he led across McMurdo Sound, Koettlitz discovered two glacial features later named after him: the Koettlitz Glacier and the Koettlitz Névé. For his role in the Discovery Expedition, Koettlitz was awarded a medal from the Royal Geographical Society.

Later in life, he practised medicine in Cradock, South Africa. He died from dysentery in January 1916, as did his French born wife on the same day.^[1][2]

• Kœttlitz, Reginald (February 1898). "Observations on the Geology of Franz Josef Land". Quarterly Journal of the Geological Society. 54 (1–4): 620–645. doi:10.1144/GSL.JGS.1898.054.01-04.44. S2CID 130568493.
• Koettlitz, Reginald (August 1900). "A journey through Somaliland and southern Abyssinia to the Shangalla or Berta country and the blue Nile, and through the Sudan to Egypt". Scottish Geographical Magazine. 16 (8): 467–490. doi:10.1080/00369220008733179.
• KŒttlitz, Reginald (January 1901). "From Para to Manaos: A trip up the lower Amazon". Scottish Geographical Magazine. 17 (1): 11–30. doi:10.1080/00369220108733217.
• "The British Antarctic Expedition: Precautions against scurvy in the victualling of the "Discovery"". BMJ. 1 (2145): 342–343. 8 February 1902. doi:10.1136/bmj.1.2145.342.

• Reginald Koettlitz collection, Scott Polar Research Institute Archives, University of Cambridge
• Reginald Koettlitz – Biographical notes
• Crew of Scott's Discovery Expedition Reginald Koettlitz biography - Scott's Forgotten Surgeon, published 2011
• Reginald Koettlitz Autograph Album and Letters at Dartmouth College Library