The concept of the unconscious is associated mainly with the psychodynamic approaches, as well as with research on latent processes in cognitive and social psychology. The aim of this article is to determine the status of this concept in Hayes’s relational frame theory (RFT) and in the interacting cognitive subsystems (ICS) theory by Teasdale and Barnard. These two theories serve as the theoretical basis for therapies that underscore aspects associated with acceptance and mindfulness. The mindfulness movement is an interesting phenomenon at the interface of science and spirituality. We believe that ICS and RFT are two different examples of how psychology can use the concept of the unconscious. ICS, adopting a cognitive model, relies on a computer metaphor of the unconscious. What it lacks is a conceptualization of the conflict of representations or needs. RFT, adopting a behavioral model, has a greater potential for explaining conflict.