: The symmetry and shape of the alar base has a major role in structuring normal appearance of the nose. The current surgical approaches aim to create a proper balance in alar base leading the patients’ high satisfaction aesthetically and functionally. Thus, careful evaluation of preoperative alar base deformities and a detailed plan for correction of these deformities during surgery will lead to optimal longterm results and complete patient satisfaction. The present study aimed to determine the common alar base disharmonies in patients who were candidates for rhinoplasty. This cross-sectional study was performed on 705 consecutive patients who were candidates for rhinoplasty surgery with the aim of primary rhinoplasty. Pre-rhinoplasty photographs of patients were evaluated in frontal, bilateral and basal views, and sizes, shapes, dimensions, as well as deformities of alar base were evaluated. The mean of nasal base width was also 33.36±2.68mm. Totally, 56.2% of participants had the apparent deviation of the nose. With regard to horizontal alar base deformity, 35.9% of cases had normal condition, while general enlargement, thick alar wall, alar flaring, nasal sill, and broad alar base conditions were revealed in 16.74%, 13.62%, 16.31%, 8.23%, and 9.22% respectively. Assessment with regard to vertical alar base malposition showed normal condition in 47.0%, unilaterally cephalad condition in 6.67%, bilaterally cephalad condition in 20.14%, unilaterally caudal condition in 3.55% and bilaterally caudal condition in 22.55%. The most common anomaly of alar-columellar relationship was related to hanging ala followed by hanging ala retracted columella. There was no difference in types of unilaterally vertical alar base malposition between the two groups with and without the apparent deviation of the nose. Because a significant number of our population had vertical alar base malposition and/or horizontal alar base deformities, more attention should be made to different types of alar base disharmonies for initial planning of rhinoplasty.