Current orthodontic treatment aims not only at achieving a good, stable functional occlusion but, increasingly, at improving the cosmetical appearance of the face and profile. To this end, the Authors believe that proper analysis of the nasolabial angle is an important consideration. A cephalometric evaluation of the soft tissue nasolabial angle and its relationship to craniofacial bony landmarks is described. Statistical data are presented from a preliminary sample of 32 orthodontic patients of whom 15 were habitual oronasal breathers. The absolute value of the nasolabial angle was very similar in the two groups but the orientation of the nasolabial angle relative to cephalometric landmarks showed statistically significant differences.