A detailed analytical study of major cations (Ca2+, Mg2+, Na+, K+) and anions (SO2− 4 , HCO−3 , Cl−, NO−3 ) of meltwater draining from Gangotri Glacier was carried out to understand major ion chemistry and to get an insight into geochemical weathering processes controlling hydrochemistry of the glacier. In the meltwater, the abundance order of cations and anions varied as follows: Ca2+ > Mg2+ > K+ >Na+ and SO2− 4 > HCO−3 > Cl− > NO−3 , respectively. Calcium and magnesium are dominant cations while sulphate and bicarbonate are dominant anions.