In this paper, the authors have attempted to estimate integrated precipitable water vapor (IPWV) over Bangalore from the troposphericzenith delay (TZD) obtained from the Global Positioning System (GPS) for the year 2016. The IPWV so estimated shows diurnal, daily and monthly variations. The diurnal, daily and monthly variations of TZD, zenith wet delay (ZWD), weighted mean temperature (Tm) and П have also been presented. The paper aims in particular, to find out the controlling factors of IPWV. For this purpose, the authors have investigated a few meteorological elements, viz., surface temperature, pressure, relative humidity and also total solar irradiance (TSI). The study shows that these parameters put together control IPWV.