The "third occipital condyle" or "median occipital condyle" (MOC) corresponds to an ossified remnant of the hypochordal arch of the proatlas. It is a rare anomaly of the craniovertebral junction that is anatomically connected to the basion and often articulates with the anterior arch of the atlas or the apex of the odontoid process of the axis. In this study, 150 skulls from the cranial collection of the Department of Anatomy at the Catholic University of Maule in Talca, Chile, were examined. Among these specimens, 2 skulls were identified with the presence of a third occipital condyle (1.33 %). Both samples were included and described as skull 1 and skull 2. A descriptive analysis of their morphological characteristics was performed, and their dimensions were measured using an electronic Vernier caliper. In both cases, the MOC was located in the midline of the anterior margin of the foramen magnum, with an articular surface that was oval, concave, and oriented downward and backward with respect to the basion. The MOC of skull 1 had a lateral diameter of 9.09 mm, a height of 6.78 mm, a distance from the right lateral articular extremity to the right occipital condyle of 3.21 mm, and a distance from the left articular extremity to the left occipital condyle of 4.61 mm. Meanwhile, skull 2 recorded a lateral diameter of 12.3 mm, a height of 7.3 mm, a distance from the right articular extremity to the right occipital condyle of 2.65 mm, and a distance from the left articular extremity to the left occipital condyle of 3.02 mm. Explaining its embryological genesis, the data provided will complement the morphopathological understanding of the presence of a third condyle in the foramen magnum. Additionally, it is expected to contribute to the understanding of its impact on craniovertebral biomechanics and its clinical implication.