Alexander Mazel, Aldo Procacci, Benedetto Scoppola Gas Phase of Asymmetric Nearest Neighbor Ising Model (21K, LaTeX 2e) ABSTRACT. We consider an asymmetric $d$-dimensional, $d > 1$, Ising model with the pair interaction $I$ in one direction different from the pair interaction $J$ in all other directions. We show that for any inverse temperature $\b$ the system is in the gas phase as soon as $|J| < C\b^{-1}d^{-2} (1-\tanh (\b |I|))$ with $C > 0$ being a small numeric constant.