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In this study, silver nanoparticles (Ag NPs) were prepared from Brassica oleracea (BO) leaflet extract (BO-AgNPs) and applied for to determination of Aspirin in pharmaceutical samples through selective and sensitive spectrophotometric standard additions method. The measurements of UV-Visible, X-ray diffraction (XRD), Fourier transform infrared (FTIR) and scanning electron microscopy (SEM) have been used to confirm the formation of BO-AgNPs, revealing a prominent absorption band at 450 nm, crystallinity, and an agglomerated morphology having an average particle size of 29 nm. Aspirin in Acifein, Aspirin, Acylpyrin and Disprin tablets was determined through the complexation with BO-AgNPs, revealing a linear range of 1-10 mg/10 mL and limit of detection (LOD) as 0.09, 0.46, 0.69 and 0.99 mg/10 mL, respectively. An average percent recovery for four samples were found to be 90, 99, 101 and 99 % and relative standard deviation (RSD) as 1.6, 0.6, 0.3 and 1.4, respectively. The suggested method was successfully used for the quantitative analysis of pharmaceutical tablets, which opens up the possibility that Ag NPs could be used to determine biological molecules when interferences from real samples are present.