The article discusses the problems of unity of consciousness, the staged part of which was published earlier. Implicit and explicit scientific ideas about the unity of consciousness are considered. As an initial set of relevant knowledge on the problem of unity of consciousness, the works of B. G. Ananyev, L. S. Vygotsky, V. P. Zinchenko, S. L. Rubinstein and other Russian psychologists, as well as T. Bayne, C. Whitehead, K. Wilber, M. Graziano are analyzed and other foreign authors. Correlated aspects of neuroscience, cognitive science, social anthropology, linguistics, ethnology and other fields of scientific knowledge are touched upon. In a plan comparable to the works under discussion, domestic ideas are considered, which partially overcome the incompatibility of existing research positions in this field. The main difficulty on this path is the need to take into account the diverse identifications of consciousness and the corresponding theories. As a necessary condition for the unity of consciousness in the group and macro-group dimensions, the unity of manifestations of individual consciousness is postulated, which are associated with fixed characteristics of the internal organization of consciousness in combination with external factors of activation of consciousness, including the researcher and/or an outside observer, or a self-aware subject. The author’s spectrum of possible forms of unity of one or another set of phenomena of consciousness is proposed. Projects of complex, integrative, systemic and synergistic levels of unity of consciousness are presented. The unity (continuity) of consciousness is defined in the forms: a) a complex of interrelated manifestations (complex unity); b) a complex of interrelated and interdependent manifestations of consciousness (integrative unity); c) systemic unity characterized by hierarchical structure of consciousness; d) metasystemic unity characterized by reflexivity of systemic manifestations of consciousness; e) synergistic and metasynergic unity characterized by self-organization (internal plan) and self-regulation (self-reflected external plan) of the functioning of consciousness in the conditions of the reflexive possibility of bifurcation.