George Frederick Leycester Marshall (March 27, 1843 - March 7, 1934) was a Colonel in the Indian Army and brother of C. H. T. Marshall and uncle of Guy Anstruther Knox Marshall. He was a naturalist interested in the birds and butterflies of India. Marshall described several new species of butterflies, along with Lionel de Nicéville, and discovered the White-tailed Iora, sometimes referred to as Marshall's Iora. He wrote The butterflies of India, Burmah and Ceylon.