Physisorption isotherms have been measured for argon, krypton, methane, and nitrogen on 304 stainless steel in the temperature range 77–90 K and in the pressure range 10−9−10−4 Torr. A static technique was used to obtain the isotherms whereby the pressure change of the test gas in a constant-volume system was measured on immersion of the commercially available 304 stainless-steel nipple in different cryogenic baths. The ionization gauge was operated at reduced emission current (25–40 μA) to minimize gauge pumping. Adsorption measurements were made at two positions on the nipple and then subtracted to give an isotherm for adsorption on a geometric area of 47.5 cm2. This difference technique was used to minimize the effect of a measured thermal gradient along the nipple wall above the bath level. The effect of system outgassing on the adsorption measurements was shown to be negligible. The isotherm data at each temperature were described empirically using the Dubinin-Radushkevich (DR) equation. Complete correlation by the (DR) equation of the temperature dependence of adsorption was not achieved for any of the adsorbates. Mean energies of adsorption calculated from the slopes of the DR plots were 1290, 1545, 1490, and 1903 cal∕mole for Ar, Kr, CH4, and N2, respectively. This is the same order as has been reported for these gases on Pyrex; however, the interaction is about 10% higher on stainless than on Pyrex for each gas. Isosteric heats of adsorption calculated from the DR equation were 4.9, 6.4, 5.9, and 6.2 kcal∕mole for Ar, Kr, CH4, and N2, respectively at θ=0.002.