The relational field, as it moves through the depth-psychology corpus, names a domain of mutual influence that exceeds the boundaries of any single psyche and cannot be reduced to the sum of its individual participants. The concept draws on multiple tributaries: field theory imported from physics and biology, object-relations insights into the intersubjective matrix, and Jungian readings of the analytic vessel as a shared alchemical space. Siegel frames the field in neurodevelopmental terms, arguing that mind itself is constitutively relational — ‘embodied and relational process’ from which selfhood emerges rather than a private possession housed within a skull. Alcaro and Carta operationalize the concept clinically as the ‘affective-relational atmosphere’ co-generated in the therapeutic encounter, wherein phenomena such as projective identification and containment are visible as field events. Kalsched, writing from a Jungian perspective, extends the field beyond transference–countertransference dyads to include dream, sandtray, and active imagination — any medium in which the dyadic self-care system constellates. Wiener’s index entry for ‘interactive field’ points to the neurological grounding of interpersonal relations, aligning the Jungian analytical relationship with an emergent relational neuroscience. Schwartz’s systems-thinking framework, seeing the universe as ‘a network of relational patterns,’ provides the meta-theoretical scaffolding within which these divergent clinical usages cohere. The central tension across the corpus is whether the field is primarily intrapsychic-in-dyad (Kalsched), somatically co-regulated (Ogden, Heller), or genuinely emergent and irreducible to its participants (Siegel, Simondon).