CBCT has facilitated the differential diagnosis due to the lower dose of radiation and higher resolution compared to CTscan. This study examines the frequency of deviated nasal septum, concha bullosa and their relationship with maxillary sinusitis based on CBCT findings. This study was conducted on 500 CBCTs cans performed in 2014-2016 using Sordex Scanora 3D (Helsinki, Finland)..Two maxillofacial radiologists examined the scans in axial and coronal sections. The data analyzed using the Chi-square test and the t-test in SPSS-18. The patients mean age was 48.12±15.59 years, 27.6% had concha bullosa. There was a significant relationship between concha bullosa and gender (P=0.001) and also age (P=0.008) There were no significant relationships between nasal deviation and gender (P=0.64). No significant relationships were observed between nasal deviation and age (P=0.86) and also between maxillary sinusitis and age (P=0.503). A statistically significant relationship was observed between concha bullosa and nasal septal deviation (P<0.001). The statistical analyses showed no significant differences between septal deviation and maxillary sinusitis (P<0.001). presence of concha bullosa may be a risk factor for septal deviation as well as maxillary sinusitis. Although the presence of concha bullosa, maybe related to the patient’s age, in general, maxillary sinusitis is not significantly related to age and gender.