Dynamic triaxial compression experiments were performed on borosilicate and soda-lime glass using a triaxial compression Kolsky bar that has two pressure chambers, one enclosing the specimen and the other enclosing the end of the transmission bar. A specimen is pre-stressed hydrostatically before being loaded by a dynamic axial stress wave. Specimen axial stress and strain are determined at high strain rates under a range of hydrostatic pressures. Borosilicate glass was subjected to pressures of 25, 50, and 100 MPa at a strain rate of 1500 s -1 , and soda-lime glass was subjected to 25, 50, and 75 MPa at 1100 s -1 . Dynamic results were compared to high-rate unconfined experiments, as well as low-rate confined experiments. It was observed that confined glass strength did not show clear strain-rate dependency. But confining pressure increased the glass strength.