Abstract: A laser alignment system includes a probe head assembly mounted for linear articulation in mutually perpendicular X, Y and Z axes, with respect to a reference plane. In a four axis version of the system, a laser probe is further mounted for rotation about a V axis relate to the reference plane. Adjustment means are provided to ensure that a laser beam emitted by the probe is perpendicular to the V axis and intersects the V axis. In a five axis version of the system, the laser probe is further rotatable about a W axis perpendicular to the reference plane. This version further incorporates a means to translate the laser beam so that the beam, when perpendicular to the reference plane, coincides with the W axis.