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Plants are known to have many biological activities. In this study, the antioxidant, oxidant, antimicrobial and antiproliferative activities of Galium aparine L. were investigated. The antioxidant and oxidant potentials of the plant, the aerial parts of which were extracted with ethanol in a Soxhlet device, were measured using Rel assay kits. Antimicrobial activity against bacteria and fungi was determined using the agar dilution method. Lung carcinoma cell line (A549) was used to determine the antiproliferative activity. As a result of the studies, total antioxidant status (TAS) value of plant extracts was determined as 5.147 ± 0.237, total oxidant status (TOS) value as 18.679 ± 0.245 and oxidative stress index (OSI) value as 0.346 ± 0.018. Plant extracts were found to be effective against test microorganisms at concentrations of 50-200 µg/mL. In addition, it was determined that the antiproliferative activity of the plant extract showed potent effects depending on the increase in the extract concentration. Finally, it was determined that Galium aparine has high biological activity and can be used as a natural pharmacological agent in this context.