Red blood cell (RBC) transfusion is associated with alterations in systemic concentrations of IL-8/CXCL8 functional homologues in a murine model. Whether RBC transfusion alters systemic neutrophil chemokine concentrations in individuals sustaining traumatic injury is not known. We conducted a retrospective, single-center study of severely injured trauma patients presenting within 12 h of injury with a base deficit > 6 and hypotension in the field. Plasma concentrations of twenty-five chemokines, cytokines, and growth factors were obtained from both transfused (N=22) and non-transfused (N=33) groups in the first 48 h following admission. The transfused group (mean RBC units ± SD: 2.7 ±1.7) tended to be older (49.9 ±21.1 versus 40.4 ±19.9 years, p=0.10), with a higher percentage of females (40.9% versus 18.2%, p=0.06), and a higher injury severity score (ISS) (27.1 ±12.7 versus 21.4 ±10.2, p=0.07). In univariate and multivariate analyses, transfusion was associated with increased hospital and ICU length of stay but not ventilator-free days. Plasma CXCL8 concentrations were higher in the transfused (mean ±SD: 84 ±88 pg/mL) than the non-transfused group (31 ±21 pg/mL, p=0.003). Using a linear prediction model to calculate bioanalyte concentrations standardized for age, gender, ISS, and admission SBP, we observed that CXCL8 concentrations diverged within 12 hours following injury, with the transfused group showing persistently elevated CXCL8 concentrations by contrast to the decay observed in the non-transfused group. Other bioanalytes showed no differences across time. RBC transfusion is associated with persistently elevated neutrophil chemokine CXCL8 concentrations following traumatic injury.