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Sylvanus Griswold Morley (June 7, 1883 – September 2, 1948) was an American archaeologist, epigrapher, and Mayanist scholar who made significant contributions toward the study of the pre-Columbian Maya civilization in the early twentieth century.

Morley is particularly noted for the extensive excavations of the Maya site of Chichen Itza that he directed on behalf of the Carnegie Institution. He also published several large compilations and treatises on Maya hieroglyphic writing, and wrote popular accounts on the Maya for a general audience.

To his contemporaries, "Vay" Morley was one of the leading Mesoamerican archaeologists of his day. Although more recent developments in the field have resulted in a re-evaluation of his theories and works, his publications, particularly on calendric inscriptions, are still cited. In his role as director of various projects sponsored by the Carnegie Institution, he oversaw and encouraged many others who later established notable careers in their own right. His commitment and enthusiasm for Maya studies helped inspire the necessary sponsorship for projects that would ultimately reveal much about ancient Mayan civilization.

Morley also conducted espionage in Mexico on behalf of the United States during World War I, but the scope of those activities only came to light well after his death. His archaeological field work in Mexico and Central America provided suitable cover for investigating German activities and anti-American activity at the behest of the United States' Office of Naval Intelligence.