This brief paper concerns excavation of several sites in Israel with glass-making facilities and related investigations of ancient glass making in the region. One site, Jalamet, was excavated from 1964-67, and turned out to be an entire factory complex dating to 352-383 A.D. The furnace could not be reconstructed exactly, although many surprising details of the facilities were brought to light. The range of glass vessels produced at the site was documented. Kafr Yasif, another site, contained the remains of a dump from a factory dating about a century later than Jalamet. A huge glass slab from a cave at Beth She'arim indicates that the 4th through 7th century glass technology was quite advanced. Finally, a furnace dating to the 13th - 14th century was excavated near the Crusader fortress of Es-Samariya. Removal of the entire feature intact is expected to permit careful study. Dr. Robert Brill also carried out a survey of the Belus River, famous in antiquity for its glass sand. More detailed publications of all results from the investigations are planned.