Lieutenant Colonel Eric Marshall CBE MC (29 May 1879 – 26 February 1963) was a British Army doctor and Antarctic explorer with the Nimrod Expedition led by Ernest Shackleton in 1907–09, and was one of the party of four men (Marshall, Shackleton, Jameson Adams and Frank Wild) who reached Furthest South at 88°23′S 162°00′E / 88.383°S 162.000°E / -88.383; 162.000 on 9 January 1909.

Born in Hampstead, Surrey, on 29 May 1879, he was educated at Monkton Combe School, Bath and at Emmanuel College, Cambridge, before qualifying as a surgeon from St Bartholomew's Hospital.

Marshall maintained his criticism of Shackleton throughout his life, referring to him as 'the biggest mountebank of the century' in one letter held at the Royal Geographical Society dated 30 August 1956.

Marshall joined the Royal Army Medical Corps and was commissioned as a second lieutenant in April 1915.

During the Second World War, Marshall rejoined the Royal Army Medical Corps and achieved the rank of lieutenant-colonel.