The Masculine Principle occupies a contested yet generative position throughout the depth-psychology corpus, functioning simultaneously as an archetypal symbol, a developmental stage marker, a cultural-historical force, and a contested normative category. Neumann provides the most systematic treatment, insisting that ‘masculine’ and ‘feminine’ designate symbolic expressions rather than biological or sociological facts, and tracing the masculine principle’s historical correlation with ego-consciousness, discriminative cognition, and the ‘reality principle’ as it emancipates itself from the matrix of the Great Mother. Jung and the alchemical tradition align the masculine principle with Logos, sulfur, and spirit, setting it in coniunctive tension with a feminine Eros. Emma Jung refines this in the animus literature, charting the degrees to which masculine energies may be integrated harmoniously or destructively within feminine psychology. Woodman critically complicates the term, distinguishing the genuine masculine principle from what she prefers to call the ‘power principle,’ warning that patriarchal distortion has alienated both sexes from authentic masculine and feminine expression. Moore re-mythologizes the mature masculine through four archetypal energies — King, Warrior, Magician, Lover — insisting that post-initiatory masculine selfhood is the deficit most urgent for contemporary men. Papadopoulos notes the conceptual difficulties attending Jung’s assignment of Logos to male psychology. Across all voices, the term remains irreducibly dialectical: the Masculine Principle becomes legible only in relation to its feminine counterpart, and its pathologies are as diagnostic as its ideals.