The study aims to investigate the mean values of crown inclinations and crown angulations of northern Thais with good occlusion. All samples had passed the active growth period and never had any orthodontic treatment. Measurements of each tooth (except third molars) from the study models of 60 samples (30 males and 30 females) were performed twice by using modified surveyor and protractor. The average values of the first and the second measurements were used for statistical analysis. The results were as follows. 1. The means of the crown inclinations of maxil- lary central incisor, lateral incisor, canine, first premo- lar, second premolar, first molar and second molar were 8.20, 6.27, -5.95, -8.04, -8.2, -9.50 and -8.38 degrees respectively. 2. The means of the crown inclinations of man- dibular central incisor, lateral incisor, canine, first premolar, second premolar, first molar and second molar were 5.36, 2.26, -3.77, -13.19, -18.93, -25.17 and-34.69 degrees respectively.3. The means of the crown angulations of maxil- lary central incisor, lateral incisor, canine, first premo- lar, second premolar, first molar and second molar were 3.45, 4.77, 2.45, -1.34, -0.18, -2.19 and -7.48 degrees respectively. 4. The means of the crown angulations of man- dibular central incisor, lateral incisor, canine, first premolar, second premolar, first molar and second molar were -0.18, -0.57, -0.02, 0.89, 3.63, 5.58 and 7.57 degrees respectively.