Within the depth-psychology and bereavement corpus, ‘mediators of mourning’ designates those variables that account for the wide individual variation in grief intensity, duration, timing, and outcome — functioning not as causes of grief per se but as modulators of its trajectory. The concept is most systematically developed by J. William Worden, whose taxonomy distinguishes at least six primary mediators: the nature of the attachment to the deceased, the circumstances of the death (including suddenness and mode), historical antecedents such as prior loss and mental health history, personality variables (attachment style, coping style, cognitive style, self-esteem), beliefs and worldview, and social variables including perceived support. Worden’s framework insists that mourning behavior is ‘multidetermined,’ resisting any single-variable explanation and demanding that clinicians and researchers alike resist reductive models. The concept carries direct clinical consequence: identifying which mediators are active in a given case shapes assessment, informs risk-stratification for complicated grief, and guides intervention priorities. The term also carries an implicit critique of stage and phase models, which inadequately account for individual difference. Tensions in the literature concern whether mediators are stable traits or modifiable, how comediators interact, and whether researchers risk overlooking relational and meaning-making variables by focusing narrowly on measurable constructs such as depression and social support.