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Aims: Extracellular matrix remodelling is one of the key pathways involved in heart failure (HF) progression. Sodium–glucose cotransporter 2 inhibitors (SGLT2i) may have a role in attenuating myocardial fibrosis. The impact of SGLT2i on blood markers of collagen turnover in humans is not fully elucidated. This study aimed to investigate the effect of empagliflozin on serum markers of collagen turnover in patients enrolled in the EMPEROR‐Preserved and EMPEROR‐Reduced trials. Methods and results: Overall, 1084 patients (545 in empagliflozin and 539 in placebo) were included in the analysis. Procollagen type I carboxy‐terminal propeptide (PICP), a fragment of N‐terminal type III collagen (PRO‐C3), procollagen type I amino‐terminal peptide (PINP), a fragment of C‐terminal type VIa3 collagen (PRO‐C6), a fragment of type I collagen (C1M), and a fragment of type III collagen (C3M) were measured in serum at baseline, 12 and 52 weeks. A mixed model repeated measurements model was used to evaluate the effect of empagliflozin versus placebo on the analysed biomarkers. Higher baseline PICP, PRO‐C6 and PINP levels were associated with older age, a more severe HF presentation, higher levels of natriuretic peptides and high‐sensitivity troponin T, and the presence of comorbid conditions such as chronic kidney disease and atrial fibrillation. Higher PICP levels were associated with the occurrence of the study primary endpoint (a composite of HF hospitalization or cardiovascular death), and PRO‐C6 and PINP were associated with the occurrence of sustained worsening of kidney function. On the other hand, PRO‐C3, C1M, and C3M were not associated with worse HF severity or study outcomes. Compared to placebo, empagliflozin reduced PICP at week 12 by 5% and at week 52 by 8% (week 12: geometric mean ratio = 0.95, 95% confidence interval [CI] 0.91–0.99, p = 0.012; week 52: geometric mean ratio = 0.92, 95% CI 0.88–0.97, p = 0.003). Additionally, empagliflozin reduced PRO‐C3 at week 52 by 7% (week 12: geometric mean ratio = 0.98, 95% CI 0.95–1.02, p = 0.42; week 52: geometric mean ratio = 0.93, 95% CI 0.89–0.98, p = 0.003), without impact on other collagen markers. Conclusion: Our observations are consistent with experimental observations that empagliflozin down‐regulates profibrotic signalling. The importance of such an effect for the clinical benefits of SGLT2i in HF remains to be elucidated. [ABSTRACT FROM AUTHOR]