Abstract: A glass cutter for flat glass comprising a frame having a first arm connected to a transversely disposed second arm, a glass cutting head being slidably disposed on the first arm, which glass cutting head may be selectively locked in position at any desired point along the first arm, and the second arm being provided with rollers or wheels adapted to engage and be guided by an edge of a sheet of glass while the cutting head engages a face thereof. The rollers or wheels being preferably mounted on axes disposed at an angle of from 15.degree. to 75.degree., preferably 30.degree. to 60.degree. to the longitudinal axis of the first arm.