Objective: Previous studies suggested that elevated serum g-glutamyl transferase (GGT) level is an independent predictor of coronary artery disease (CAD) and heart failure (HF). However, whether serum GGT level has a predictive role for HF after percutaneous coronary intervention (PCI) remains unclear. This study aimed to evaluate the association of GGT with HF after PCI in a Chinese population. Methods: Five thousand six hundred thirty-eight patients were divided into three groups according to GGT tertiles: first tertile (GGT <19.6 U/L; n = 1875), second tertile (GGT ‡19.6-32.9 U/L; n = 1880), and third tertile (GGT ‡32.9 U/L; n = 1883). There were 165 (2.9%) HFs during a long-term follow-up. The average follow-up time was 35.9-22.6 months. Results: The incidence of HF in the first tertile is 62 (3.3%), second tertile is 38 (2.0%), and third tertile is 65 (3.5%). The HF incidence was significantly lower in second tertile compared with that in the first tertile or in the third tertile (both P < 0.05). A U-shaped curve was observed according to quintiles (Q1:3.4%, Q2: 3.0, Q3:1.6%, Q4: 2.9%, Q5: 3.7%, P = 0.042). The multivariate Cox proportional hazards model showed after adjustment of confounders, the association remains significant (P = 0.046). Conclusions: This study indicated that serum GGT concentration was independently associated with HF after PCI. The baseline serum GGT level less than 19.6 or ‡32.9 increases HF risk in CAD patients who underwent PCI.