Eva Margareta Steinby FSA (born 21 November 1938) is a Finnish classical archaeologist.
She was the director of the Finnish Institute in Rome from 1979–82 and 1992-4, and Professor of the Archaeology of the Roman Empire at the Institute of Archaeology, University of Oxford from 1994-2004.
She is best known for her work on the architecture and topography of Rome, especially due to her contributions to the Lexicon Topographicum Urbis Romae (1993-2000).