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Research on psychological flow is well established, although criticisms remain regarding conceptual and measurement issues associated with the construct. This scoping review maps flow-related research across scientific disciplines, examining the conceptualization, measurement instruments, and outcomes of flow between 2012 and 2019. Across 236 sources that met the review criteria, 108 different flow-related constructs were measured by 141 instruments, and 84 possible antecedents were identified. Despite the varied approaches, a common set of overarching antecedent constructs included "optimal challenge" and "high motivation," and recurring characteristics of the flow experience itself included "absorption," "effort-less control," and "intrinsic reward." Applied studies—albeit inconsistent in approach and largely correlational in nature—predominantly linked flow to "positive development" (i.e., well-being and health), "high functioning," and "further engagement." We contextualize the findings of the review relative to important work on flow that has recently emerged (following the review period)—in doing so, we hope this review offers a contemporary framework that can be used for the study of flow across scientific disciplines. Public Significance Statement: This review scopes flow research across all scientific disciplines and identifies key commonalities and differences in how researchers have conceptualized the psychological state of flow—an optimal experience often referred to as being "in the zone." It addresses inconsistencies and concerns of practical application that characterize some contemporary flow-related models and studies. This review also provides a framework––derived from the findings of the review––for the study of flow antecedents and experiential dimensions. [ABSTRACT FROM AUTHOR]