Arnold Patrick Spencer-Smith (1883–1916) was a British clergyman and amateur photographer who joined Sir Ernest Shackleton's Imperial Trans-Antarctic Expedition, 1914–17, as Chaplain and photographer on the Ross Sea party. The hardship of the expedition resulted in Spencer-Smith's death. Cape Spencer-Smith on White Island at 78°00′S 167°27′E is named in his honour.
He attended Westminster City School, King's College London and Queen's College, Cambridge.
Arnold Spencer-Smith was unmarried. He dedicated a final diary entry, 7 March 1916, to his father, mother, brothers and sisters. He is commemorated by Cape Spencer-Smith on White Island
In 1999 a team of investigators entered Captain Scott's hut at Cape Evans, and found a wallet with three photographs of a camping expedition in it. After extensive investigations it was established that this wallet had belonged to Arnold Spencer-Smith. The wallet, mislaid in 1915, was thus found after 84 years