Sanballat the Horonite (Hebrew: סנבלט) — or Sanballat I (Hebrew: סנבלט לי) — was a Samaritan leader and official of the Achaemenid Empire of Greater Iran who lived in the mid to late 5th century BC and was a contemporary of Nehemiah.
In Hebrew the name is Sanballat (Hebrew: סַנְבַלָּט). Eberhard Schrader, cited in Brown–Driver–Briggs, considered that the name in Akkadian was Sīnuballit, from the name of the Sumerian moon god Sīn meaning "Sīn has begotten."
The name of the god Sīn in the context of Sanballat's name has since been mistakenly confused with the unrelated English noun sin in some popular English commentaries on Nehemiah. Other earlier commentators had sometimes taken Sanballat as being a military rank rather than a name.
He is best known from the Book of Nehemiah, which casts him as one of the chief opponents of the Jewish governor Nehemiah during the latter's efforts to rebuild the walls of Jerusalem and carrying out his reforms among the Jews. In Jewish tradition, he was called "the Horonite," (another possible "the Harranite") and was associated with Tobiah the Ammonite and Geshem the Arabian. His home was evidently at Samaria.
According to Nehemiah, when he and his escort arrived in Jerusalem, their return aroused the enmity of Sanballat and his allies. They were aggrieved that the welfare of the Jews should be fostered. When Nehemiah actually disclosed his intention of building the walls of Jerusalem they laughed him to scorn, and said, "Will ye rebel against the king?" Nehemiah resented their insinuation, and told them that they had no right in Jerusalem, nor any interest in its affairs. As soon as Sanballat and his associates heard that Nehemiah and the Jews were actually building the walls, they were angry; and Sanballat addressed the army of Samaria with a contemptuous reference to "these feeble Jews." Tobiah appeased him by saying that a fox (or a jackal) climbing on the wall they were building would break it down. Nehemiah and his builders, the Jews, vigorously hurried the work, while Sanballat and his associates organized their forces to fight against Jerusalem. Nehemiah prepared to meet the opposition and continued the work on the walls. Five different times Sanballat and his confederates challenged Nehemiah and the Jews to meet them in battle in the plain of Ono. Nehemiah was equal to the emergency and attended strictly to his work. Then Sanballat, with Jews in Jerusalem who were his confederates, attempted to entrap Nehemiah in the Temple; but the scheme failed. Sanballat's Jewish allies, however, kept Sanballat and Tobiah informed as to the progress of the work in Jerusalem. With the hand of the Lord upon Nehemiah along with Nehemiah's far-sighted policy and his shrewdness, he was kept out of the hands of these neighbor-foes. In his reforms, so effectively carried out, he discovered that one of the grandsons of the current high priest Eliashib had married a daughter of this Sanballat, and was thus son-in-law of the chief enemy of the Jews. Nehemiah also found that Eliashib had leased the storerooms of the temple to Tobiah, thus depriving the Levites of their share of the offerings in Nehemiah's absence. The high priest (and/or possibly his son Jehoida and the unnamed grandson) was driven out of Jerusalem on the ground that he had defiled the priesthood (Nehemiah 13:28).