Ion Horaţiu Crişan (1928–1994) was a Romanian historian and archaeologist. He conducted research in South-Eastern and Central Europe, focusing on Geto-Dacians and Celts. He has been was very involved with the research at the archaeological site called Şanţul Mare (The Big Ditch), 7 km from Pecica, Arad County, Romania. He placed the Dacian settlement Ziridava, mentioned by Ptolemy in his Geographia, at this location with a high degree of certainty. He wrote a book named Ziridava - The digs from "Șanțul Mare" from 1960, 1961, 1962, 1964, focused on the archaeological digs performed in 1960s at this ancient city.