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In the summer of 2014, Columbia University’s Department of Art History and Archaeology initiated, under the auspices of The Athens Archaeological Society, the excavation of the sanctuary of Poseidon at Onchestos, the seat of the Boeotian Confederacy and one of the few Greek sacred places mentioned in the Iliad. The excavation has focused on two large areas (Site A: 0.6 ha; Site B: 1.03 ha) between Thebes and Haliartos. The excavation has already yielded a rich array of finds: vases and vase-fragments (several bearing graffiti), countless bronze objects (including several strigils), bronze and silver coins, weapons (among them a fully preserved sword), objects associated with horse- and chariot races, and many architectural elements (including several architectural terracottas bearing floral and abstract decoration in black, white, and red color on a beige background; fragments of Ionic columns; two Ionic corner capitals). After only three years of excavation, the questions are still far more numerous than the answers, but we can securely state that the site was one of the major sanctuaries of Central Greece.