Abstract: The present invention refers to a safety lock for glass doors with a standard cut. This lock has two covers (1 and 9) and a strike plate (13), defining an internal space, inside which it is the lock mechanism of reduce dimensions, where the Hungarian type lock cylinder (11) is firmly attached. The lock mechanism is comprised by part of the base cover (1), which perpendicular walls to the base form a substantially rectangular box, having two crenellated parallel walls and perpendicular to the strike plate (13). Inside this box is arranged an internal mechanism comprised by a grooved lower plate (2), a locking plate (3), a pin (4), a spring (5) and a grooved upper plate (7) the grooves in the lower and upper plates being matched one another.