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Background: COVID‐19‐associated pulmonary aspergillosis (CAPA) has been widely reported but homogenous large cohort studies are needed to gain real‐world insights about the disease. Methods: We collected clinical and laboratory data of 1161 patients hospitalised at our Institute from March 2020 to August 2021, defined their CAPA pathology, and analysed the data of CAPA/non‐CAPA and deceased/survived CAPA patients using univariable and multivariable models. Results: The overall prevalence and mortality of CAPA in our homogenous cohort of 1161 patients were 6.4% and 47.3%, respectively. The mortality of CAPA was higher than that of non‐CAPA patients (hazard ratio: 1.8 [95% confidence interval: 1.1–2.8]). Diabetes (odds ratio [OR] 1.92 [1.15–3.21]); persistent fever (2.54 [1.17–5.53]); hemoptysis (7.91 [4.45–14.06]); and lung lesions of cavitation (8.78 [2.27–34.03]), consolidation (9.06 [2.03–40.39]), and nodules (8.26 [2.39–28.58]) were associated with development of CAPA by multivariable analysis. Acute respiratory distress syndrome (ARDS) (2.68 [1.09–6.55]), a high computed tomography score index (OR 1.18 [1.08–1.29]; p <.001), and pulse glucocorticoid treatment (HR 4.0 [1.3–9.2]) were associated with mortality of the disease. Whereas neutrophilic leukocytosis (development: 1.09 [1.03–1.15] and mortality: 1.17 [1.08–1.28]) and lymphopenia (development: 0.68 [0.51–0.91] and mortality: 0.40 [0.20–0.83]) were associated with the development as well as mortality of CAPA. Conclusion: We observed a low but likely underestimated prevalence of CAPA in our study. CAPA is a disease with high mortality and diabetes is a significant factor for its development while ARDS and pulse glucocorticoid treatment are significant factors for its mortality. Cellular immune dysregulation may have a central role in CAPA from its development to mortality. [ABSTRACT FROM AUTHOR]