Margaret Crosby (1902 - 1972) was an American archaeologist and historian. Crosby graduated from Bryn Mawr College in 1922, and subsequently became involved in archaeology and ancient history, especially epigraphy and metrology, earning her PhD at Yale University. During World War II, Crosby joined the Office of Strategic Services (OSS) and worked as a cryptographer for the OSS' Greek Desk, deciphering reports and materials for the Allied Forces.