Adsorption isotherm data for water vapor on F-200 7 x 14 Tyler mesh activated alumina are obtained at (5, 15, 25, and 35) degreesC in the range 0% to approximately 95% relative humidity using a static gravimetric technique. F-200 is a commercially available adsorbent that has become very popular in industry for drying compressed air via pressure or temperature swing adsorption. The equilibrium isotherms are presented in tabular as well as in graphical form. The equilibrium data are measured in both directions: adsorption and desorption. A pronounced hysteresis between the adsorption and the desorption legs is present at all temperatures. When plotted versus the relative humidity, the equilibrium data are essentially independent of temperature. The complete removal of the adsorbed water requires regeneration at elevated temperature (290 degreesC) under vacuum. The data reported in this study can be used in industrial design as well as in the theoretical studies on the adsorption/desorption mechanisms of water vapor on activated alumina.