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Background: Diagnostic biomarkers for detecting chronic obstructive pulmonary disease (COPD) in acute coronary syndrome (ACS) patients are not available. SERPINA1, coding for the most potent circulating anti-inflammatory protein in the lung, has been found to be differentially methylated in blood cells from COPD patients. This study aimed to investigate the methylation profile of SERPINA1 in blood cells from ACS patients, with (COPD+) or without COPD (COPD-)., Methods: Blood samples were from 115 ACS patients, including 30 COPD+ and 85 COPD- according to lung function phenotype, obtained with spirometry. DNA treated with sodium bisulfite was PCR-amplified at SERPINA1 promoter region. Methylation analysis was carried out by sequencing the PCR products. Lymphocytes count in ACS patients was recorded at hospital admission and discharge., Results: SERPINA1 was hypermethylated in 24/30 (80%) COPD+ and 48/85 (56.5%) COPD- (p < 0.05). Interestingly, at hospital discharge, lymphocytes count was higher in COPD- patients carrying SERPINA1 hypermethylated (1.98 × 10 3  ± 0.6 cell/µl) than in COPD- carrying SERPINA1 hypomethylated (1.7 × 10 3  ± 0.48 cell/µl) (p < 0.05)., Conclusions: SERPINA1 is hypermethylated in blood cells from COPD+ patients. COPD- carrying SERPINA1 hypermethylated and high lymphocytes count may be at risk of COPD development. Therefore, SERPINA1 hypermethylation may represent a potential biomarker for predicting COPD development in ACS patients.