This theoretical study seeks to understand the therapeutic functions of witnessing in drama therapy, and if they are unique to the modality, through synthesis and analysis of literature in the field and across a broad spectrum of psychotherapy modalities. The research finds that the most salient functions of the witness in drama therapy are to build a client’s inner-observer, and to validate and acknowledge their resolution of inner-conflict or transformation towards the realization of a desired future-self. While the research identified that the therapeutic function of the witness is largely similar across many modalities, there are unique approaches to utilizing these functions in drama therapy, including integration with other core drama therapy processes such as embodiment and dramatic projection, as well as a focus on mutual transformation.