This paper reviews the effectiveness of unconventional monetary policies and their relevance for emerging markets. Such policies may be useful either when interbank rates fall to zero, or when a credit crunch or rise in risk premium impairs the normal transmission mechanism of monetary policy. Unconventional monetary policy measures encompass three broad categories: (i) commitment effect, i.e., verbal commitments to maintain very low interest rates for a certain period, either conditionally or unconditionally; (ii) quantitative easing, i.e., targeting the level of current account balances of the central bank; and (iii) qualitative or credit easing, which involves purchases of targeted assets to lower rates and/or increase liquidity in the target market. It also examines issues related to the exit strategy from unconventional policy, and assesses the applicability of unconventional policies for Asian economies other than Japan. Most studies of the commitment effect (or duration effect) suggest that statements by a central bank regarding the duration of a policy of very low or zero interest rates also affect market expectations of interest rates, but the impact is mainly limited to shorter-term rates. The literature on the effects of quantitative easing monetary policy is less conclusive, especially when one accounts for other announcements by the central bank. Regarding qualitative easing (credit easing) policy, the effect of expanding outright purchases of government bonds on bond yields looks limited. However, other kinds of asset purchase interventions do seem to have been more successful in relieving market stresses. For Asian countries aside from Japan, unconventional policies look most attractive as a way to relieve funding blockages in specific markets rather than to stimulate overall growth. Only India; Republic of Korea; Singapore; and Taipei,China adopted unconventional measures, and those of the middle two were chiefly related to their use of the Fed's swap line for United States dollars to ease dollar shortages in the region. However, if growth of United States consumption slows structurally, this may force Asian economies to rely more on unconventional monetary policy measures during future downturns.