Anthropometric studies of the lips have been carried out in Caucasians, Orientals (Chinese) and Indians. Knowledge of lip parameters in Nigerians is drawn from studies of heterogeneous and unconnected population. A comprehensive study drawn from a homogenous Nigerian adult population will provide objective values against which outcomes of lip surgeries will be compared to. The lip parameters measured included: upper and lower lip thickness, upper lip curtain and height, Intercommissural distances measured with lips at rest, maximum smiling position and pursed. Vertical distance of the mouth aperture while the mouth was open wide was also taken. The following indices were calculated: coefficient of upper lip curvature, lip elasticity index, extent of oral access, upper lip-vermillion index and upper lip-mouth index. These indices were to serve as template to which results of lip surgeries are compare to. Paired t-test was carried out to determine the level of significance of sexual dimorphism of these parameters. ANOVA was used to determine the relationship between height, sex, age and weight to lip parameters was also determined. Significant values were taken as p-values of <0.05 for all analysis. Sexual dimorphism of lip parameters was observed in this study. the mean upper lip height in this study was 29.26mm SD= 6.556 for females and 32.49mm, SD= 12.33 for males. The male subjects had significantly higher values of all linear measurements compared to the female subjects (p-values of 0.00 for mouth width; 0.007 for upper lip curtain; 0.008 for upper lip thickness 0.001 for upper lip height; 0.000 for soft tissue gape) except for lower lip thickness where the females were observed to have a slightly higher value (mean thickness of the lower lip in females was 15.5mm compared with 15.35mm in males p= 0.807). There was however no difference between the sexes with respect to the calculated proportional indices. The height of the study population significantly affected width of the mouth IDS and upper lip thickness positively (p=0.000 and 0.012 respectively) using the multiple regression analysis while age of the subjects bears a negative relationship to the upper lip thickness. Surgical planning of lip procedures should be based on an objective assessment of lip parameters in patients. Comparing measurements of these parameters following of lip surgeries to the established normal values is recommended as objective measures of assessing the outcome of any surgical procedures on the lip.