Ageing population is steadily increasing globally with increase in the life expectancy. With ageing, kidney undergoes many structural and functional changes which along with others factors, makes it vulnerable to various insults like dehydration, sepsis and medications. Acute kidney injury (AKI) is defined by KDIGO criteria as any of the following, increase in serum creatinine by 0.3 mg /dl within 48 hours or increase in serum creatinine to 1.5 times of baseline, which is presumed to have occurred within the period of 7 days or urine output of less than 0.5 ml/ kg/ hour for six hours. This study tried to assess the correlation between etiology and in- hospital outcomes of AKI in geriatric patients.