Abstract : Vertebrobasilar insufficiency (VBI) mainly affects elderly people and involves reduced blood flow in the posterior part of the brain. The vertebrobasilar (VB) flow system is also called the posterior circulation, comprising the vertebral arteries, basilar artery, and posterior cerebral arteries and their branches, supplying the brainstem, thalamus, hippocampus, cerebellum, and regions of the occipital and temporal lobes. Dementia is the outcome of the Vertebrobasilar insufficiency that can be proved as lethal source for life. In this affected person loose the senses of maturity, reasoning for life and whatever is happening in the state of livings. To determine the association between vertebrobasilar insufficiency and mixed dementia in geriatric population. Analytical cross sectional study was conducted to determine association between vertebrobasilar insufficiency and mixed dementia. Sample of 135 elderly people was taken from different Neuro- centres in Lahore. VBI test of the participants was done. Mini-Mental State Examination of dementia Levels was evaluated. 23% were having positive VBI test. 77% were negative. 51.9% were having mild dementia, 25.9% were having moderate dementia, 14.1% were having no dementia and 8.1% were having severe dementia. Mean MINI-MENTAL STATE EXAMINATION Score was found 21 out of total 30 with SD±5.4. Higher score indicates lower dementia. P value indicates that there is significant association between VBI test and MINI-MENTAL STATE EXAMINATION (P value .000) This study concluded that there is significant association between VBI test and MINI-MENTAL STATE EXAMINATION.