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Background & objective: Cytokine storms play a significant role in conditions leading to multi-organ failure in patients with severe corona virus disease-2019 (COVID-19). The eradication of pro-inflammatory cytokines through hemoperfusion has been suggested to be a possible strategy to improve outcomes in these patients. We evaluated the impact of adjunctive HA330 hemoperfusion on outcomes in severe COVID-19 patients. Methodology: A single-center retrospective cohort study was conducted from December 2021 to December 2022. We included severe COVID-19 patients with elevated pro-inflammatory markers, who received three consecutive sessions of HA330 hemoperfusion in addition to the standard treatment protocol. Clinical data, including demographic information, baseline characteristics, and treatment outcomes, were analyzed. Results: We evaluated 24 severe COVID-19 patients. We observed a significant reduction in levels of CRP (P < 0.001) and IL-6 (P = 0.042), as well as a significant increase in arterial partial pressure of oxygen (P = 0.041). Importantly, no patient experienced cytotoxicity after the HA330 hemoperfusion sessions, confirming the biocompatibility of the treatment. Conclusion: Three consecutive sessions of HA330 hemoperfusion, used as an adjunctive therapy to standard care in severe COVID-19 patients, effectively reduced pro-inflammatory cytokine levels and improved oxygenation. However, large multicenter trials are required to validate these clinical outcomes. [ABSTRACT FROM AUTHOR]