Abstract: An improved glass cutter that automatically lubricates a cutting blade included therein is disclosed. The glass cutter comprises an end cap with an always open vent hole, a sleeve serving as a cutting oil reservoir, a barrel with annular grip, a cutter head, tube, wick, cutting blade, and spring. An upper portion of the cutter head is slidably engaged by a pair of opposed slots in a lower portion of the barrel to prevent rotation of the cutter head, and to limit the inward movement of the cutter head while the glass cutter is operated. The spring is disposed about the tube and pushes the cutter head and barrel apart when the glass cutter is unused. This in turn prevents fluid communication between the wick and the cutting blade by spacing the wick and cutting blade apart.