(Henry) Guy Ellcock Pilgrim (Stepney, Barbados, December 24, 1875 – Upton, then in Berkshire, September 15, 1943) was a British geologist and palaeontologist.
He was a Fellow of the Royal Society and Superintendent of the Geological Survey of India, and made significant contributions to Cenozoic continental stratigraphy and vertebrate palaeontology.
He was appointed to the Geological Survey of India in 1902 and promoted to superintendent in 1920, a post he held until his retirement in 1930.
He spent much of his retirement at the Department of Geology at the British Museum.
He was the first European to visit parts of Trucial Oman and the first geologist to explore Bahrain Island where his discoveries lead to the present oil exploitations there.