  In the quantum realm, there are curious correlations between the properties of distant systems. An example of such correlations is provided by the famous Einstein-Podolsky-Rosen/Bohm experiment. The correlations in the EPR/B experiment strongly suggest that there are non-local influences between distant systems, i.e., systems between which no light signal can travel, and indeed orthodox quantum mechanics and its various interpretations postulate the existence of such non-locality. Yet, the question of whether the EPR/B correlations imply non-locality and the exact nature of this non-locality is a matter of ongoing controversy. Focusing on EPR/B-type experiments, in this entry we consider the nature of the various kinds of non-locality postulated by different interpretations of quantum mechanics. Based on this consideration, we briefly discuss the compatibility of these interpretations with the special theory of relativity.