Four adsorption isotherms at 278, 288, 293, and 303 K of 2-methylpropene and 1,3-butadiene on activated carbon are given. The results at pressures up to 0.8P/P(s) are measured using an automated apparatus and correlated by the vacancy solution model of Cochran and Danner (AIChE J. 1985, 31 (2), 268-277).