Grief often disrupts emotion regulation, yet few interventions target its physiological basis. This study examined whether BEAR (Body-focused Emotional Acceptance and Release) therapy enhances regulation by increasing heart rate variability (HRV), a marker of autonomic flexibility. Participants (N = 37) were randomly assigned to a BEAR or control condition. HRV and emotional intensity (measured via Visual Analog Scale, VAS) were assessed pre- and post-intervention. While the BEAR group exhibited descriptively greater HRV increases and reductions in emotional intensity, these differences were not statistically significant. Condition did not significantly predict HRV change (B = 1.66, p = .76) or emotional intensity (B = –0.62, p = .15). Mediation analysis using 5,000 bootstrap samples indicated no significant indirect effect of HRV on emotional intensity (ACME = –0.01, p = .76). These findings do not support the hypothesized mediation model, though the observed trends suggest BEAR may hold promise for supporting emotion regulation in grief.