Nahman Avigad (Hebrew: נחמן אביגד, September 25, 1905 – January 28, 1992), born in Zawalow, Galicia (then Austria, now Zavaliv, Ukraine), was an Israeli archaeologist.
Avigad studied architecture in what is now the town of Brno, Czech Republic. Avigad emigrated to Mandatory Palestine in 1926. He married Shulamit (née Levin) Avigad in 1928. He worked in the excavations of the Beth Alpha synagogue and the Hamat Gader synagogue.
Avigad earned his PhD in 1952, with a dissertation on the tombs of the Kidron Valley, Jerusalem. He taught at Hebrew University from 1949 and until his retirement in 1974.
He directed the dig at Beit She'arim beginning in 1953. Avigad also worked on the excavations of Masada, the mountaintop complex built by Herod the Great. He was involved in the exploration of caves in the Judean desert, and published one of the Dead Sea scrolls.
In 1969, Avigad was invited to undertake the excavation of the Jewish Quarter in the Old City of Jerusalem, devastated by the 1948 war and its aftermath. Among the finds were what was believed to be the earliest depiction of the menorah that once burned in the Second Temple, cut into a wall plastered 2,200 years ago, and the Burnt House, the remnant of a building destroyed when Titus, the future Roman Emperor, repressed the Great Jewish Revolt against Roman rule. This was the first physical or archaeological evidence for the destruction described in the work of Flavius Josephus. The dig also unearthed lavish villas belonging to the Herodian upper classes, remains of the Byzantine Nea (new) Church and Jerusalem's Cardo, a fifth-century 70-foot (21 m)-wide road connecting the Church of the Holy Sepulcher and Nea Church. Among the most exciting finds was the remnants of the Broad Wall twice mentioned in the Book of Nehemiah. Built to defend Jerusalem during the reign of King Hezekiah in the late 8th century BCE, there remains an 80-foot (24 m) stretch of wall, 23 feet (7.0 m) thick, rising from bedrock west of the Temple Mount. Nearby, Avigad also unearthed the Israelite Tower, a remnant of Jerusalem's Iron Age fortifications attesting to the Babylonian sack of Jerusalem in 586 BCE.